Tetra Tech EC, Inc. v. Wisconsin Department of Revenue , 382 Wis. 2d 496 ( 2018 )


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    2018 WI 75
    SUPREME COURT            OF   WISCONSIN
    CASE NO.:               2015AP2019
    COMPLETE TITLE:         Tetra Tech EC, Inc., and Lower Fox River
    Remediation LLC,
    Petitioners-Appellants-Petitioners,
    v.
    Wisconsin Department of Revenue,
    Respondent-Respondent.
    REVIEW OF A DECISION OF THE COURT OF APPEALS
    Reported at 
    373 Wis. 2d 287
    , 
    890 N.W.2d 598
                                    PDC No: 
    2017 WI App 4
    - Published
    OPINION FILED:          June 26, 2018
    SUBMITTED ON BRIEFS:
    ORAL ARGUMENT:          December 1, 2017
    SOURCE OF APPEAL:
    COURT:               Circuit
    COUNTY:              Brown
    JUDGE:               Marc A. Hammer
    JUSTICES:
    CONCURRED:           A.W. BRADLEY, J., concurs, joined by ABRAHAMSON,
    J. (opinion filed).
    ZIEGLER, J., concurs. ROGGENSACK, C.J., joins
    Part I (opinion filed).
    GABLEMAN, J., concurs, joined by ROGGENSACK,
    C.J. (opinion filed).
    DISSENTED:
    NOT PARTICIPATING:
    ATTORNEYS:
    For        the   petitioners-appellants-petitioners,   there    were
    briefs filed by           Barret V. Van Sicklen,   Frederic J. Brouner,
    Donald Leo Bach, and DeWitt Ross & Stevens S.C., Madison.             There
    was an oral argument by Barret Van Sicklen.
    For the respondent-respondent, there was a brief filed by
    Misha Tseytlin, solicitor general, with whom on the brief were
    Brad D. Schimel, attorney general, and Kevin M. LeRoy, deputy
    solicitor    general.        There   was       an     oral    argument       by     Misha
    Tseytlin.
    An amicus curiae brief was filed on behalf of Wisconsin
    Institute for Law & Liberty, Inc. by Richard M. Esenberg, Thomas
    C.   Kamenick,    and    Wisconsin       Institute       for     Law     &    Liberty,
    Milwaukee.
    An amicus curiae brief was filed on behalf of Wisconsin
    Utilities Association by James E. Goldschmidt, Bradley Jackson,
    and Quarles & Brady LLP, Madison and Milwaukee.
    An amicus curiae brief was filed on behalf of Wisconsin
    Manufacturers     and    Commerce,           Inc.,     Midwest     Food       Products
    Association,     Metropolitan     Milwaukee          Association       of    Commerce,
    Wisconsin      Bankers    Association,              Wisconsin      Cheese          Makers
    Association,      Wisconsin       Paper         Council,         Dairy        Business
    Association,     Inc.,   Associated      Builders       and     Contractors,        Inc.
    (Wisconsin   Chapter),       Wisconsin       Potato     and     Vegetable         Growers
    Association,     Wisconsin    Farm   Bureau          Federation,    and      Wisconsin
    Corn Growers Association by Robert I. Fassbender and Great Lakes
    Legal Foundation, Madison.
    2
    
    2018 WI 75
                                                                   NOTICE
    This opinion is subject to further
    editing and modification.   The final
    version will appear in the bound
    volume of the official reports.
    No.    2015AP2019
    (L.C. No.   2015CV132)
    STATE OF WISCONSIN                           :            IN SUPREME COURT
    Tetra Tech EC, Inc. and Lower Fox River
    Remediation LLC,
    Petitioners-Appellants-Petitioners,                     FILED
    v.
    JUN 26, 2018
    Wisconsin Department of Revenue,
    Sheila T. Reiff
    Clerk of Supreme Court
    Respondent-Respondent.
    REVIEW of a decision of the Court of Appeals.               Affirmed.
    ¶1    DANIEL KELLY, J.      The Wisconsin Department of Revenue
    (the "Department") imposed a tax on the petitioners pursuant to
    Wis. Stat. § 77.52(2)(a)11. (2007-08) for the "processing" of
    river sediments into waste sludge, reusable sand, and water.
    The   petitioners    say   the   statutory   term      "processing"        is    not
    expansive enough to cover the separation of river sediment into
    No.   2015AP2019
    its    component    parts,        and   so     they      asked    us    to    reject     the
    Department's interpretation of that term.1
    ¶2    Because        resolving         this       question       implicates       the
    authoritativeness of an administrative agency's interpretation
    and   application      of    a    statute,        we    asked   the    parties    to   also
    address this issue:              "Does the practice of deferring to agency
    interpretations of statutes comport with Article VII, Section 2
    of the Wisconsin Constitution, which vests the judicial power in
    the unified court system?"2
    ¶3    We conclude that the term "processing" in Wis. Stat.
    § 77.52(2)(a)11. includes the separation of river sediment into
    its component parts.             Therefore, we affirm the court of appeals.
    We    have   also   decided        to   end       our    practice      of    deferring    to
    1
    This is a review of a published decision of the court of
    appeals, Tetra Tech EC, Inc. v. DOR, 
    2017 WI App 4
    , 
    373 Wis. 2d 287
    , 
    890 N.W.2d 598
    , which affirmed an order of the
    Brown County Circuit Court, the Honorable Marc A. Hammer
    presiding, that affirmed an order of the Wisconsin Tax Appeals
    Commission ("Commission").
    2
    All references to the Wisconsin Statutes with respect to
    the question of whether we defer to an administrative agency's
    interpretation of a statute are to the 2015-16 version unless
    otherwise indicated.
    All references to the Wisconsin Statutes with respect to
    the meaning of "processing," as that term is used in Wis. Stat.
    § 77.52(2)(a)11., are to the 2007-08 version unless otherwise
    indicated.   We cite this version, as the court of appeals did,
    because the relevant tax years for the case are 2007-09 and
    because the 2005-06 version of the Wisconsin Statutes, which
    would govern the 2007 tax year, is not materially different from
    the 2007-08 version. See Tetra Tech EC, Inc., 
    373 Wis. 2d 287
    ,
    ¶1 n.1.
    2
    No.    2015AP2019
    administrative agencies' conclusions of law.3            However, pursuant
    to Wis. Stat. § 227.57(10), we will give "due weight" to the
    experience, technical competence, and specialized knowledge of
    an administrative agency as we consider its arguments.4
    I.   FACTUAL BACKGROUND AND PROCEDURAL HISTORY
    ¶4     On November 13, 2007, the United States Environmental
    Protection   Agency     ("EPA")    ordered   several   paper   companies      to
    remediate the environmental impact of polychlorinated biphenyls
    ("PCBs") they had released into the Fox River as part of their
    manufacturing activities.         The paper companies created Lower Fox
    River    Remediation,    LLC   ("LFR   Remediation")    to   carry     out   the
    EPA's order.     LFR Remediation hired Tetra Tech EC, Inc. ("Tetra
    Tech") to perform the actual remediation activities.                 Tetra Tech
    subcontracted a portion of the work to Stuyvesant Dredging, Inc.
    ("Stuyvesant Dredging").5         Stuyvesant Dredging's responsibilities
    3
    Although a majority of the court agrees we should no
    longer defer to administrative agencies' conclusions of law,
    there is disagreement with respect to why we should end the
    practice. This opinion describes one rationale; other opinions
    will contain alternative bases for our conclusion.
    4
    Justice Rebecca Bradley joins the opinion in toto. Chief
    Justice Roggensack joins Sections I., II.A.1., II.A.2., II.B.,
    and III.    Justice Gableman joins Paragraphs 1-3, Sections I.,
    II. (introduction), II.A. (introduction), II.A.1., II.A.2.,
    II.A.6., II.B., and III., and the mandate, although he does not
    join Section II.A.6. to the extent that the first sentence of
    Paragraph 84 implies a holding on constitutional grounds.
    Therefore, this opinion announces the opinion of the court with
    respect to Sections I., II.A.1., II.A.2., II.B., and III.
    5
    Stuyvesant Dredging is now known as Stuyvesant Projects
    Realization, Inc.
    3
    No.     2015AP2019
    included receiving sediment dredged from the Fox River, and then
    using membrane filter presses to separate it into its component
    parts:      water, sand, and PCB-containing sludge.                                Part of the
    purpose of Stuyvesant Dredging's work was to "provide a supply
    of relatively clean sand that could be sold for off-site use or
    used beneficially on site."
    ¶5    In 2010, the Department conducted a field audit of
    both Tetra Tech and LFR Remediation (collectively, "Taxpayers").
    During that same year, the Department issued a Notice of Field
    Audit    Action   that    assessed         a       use    tax       on     LFR    Remediation's
    purchase of the portion of Tetra Tech's remediation services
    that    represented     Stuyvesant        Dredging's            work.            The    Department
    also issued a Notice of Field Audit Action that assessed a sales
    tax on the portion of Tetra Tech's sale of remediation services
    to   LFR    Remediation      (to    the        extent          it    reflected          Stuyvesant
    Dredging's     work).        In     both           notices,          the    Department          said
    Stuyvesant     Dredging's          activities             constituted             the     "repair,
    service,     alteration,        fitting,           cleaning,             painting,        coating,
    towing,     inspection       and      maintenance               of       tangible         personal
    property," and so were taxable under Wis. Stat. § 77.52(2)(a)10.
    ¶6    Tetra    Tech      and       LFR           Remediation          petitioned          the
    Department    for     redetermination              of    the        assessed      taxes.         The
    Department     denied     the     petitions,             concluding         that        Stuyvesant
    Dredging's "dewatering and desanding of dredged, contaminated
    sediment that is not returned to the river is a service to
    tangible personal property" that was taxable under Wis. Stat.
    § 77.52(2)(a)10.         Tetra      Tech       and       LFR    Remediation             then   filed
    4
    No.      2015AP2019
    petitions       with     the    Wisconsin       Tax        Appeals     Commission          (the
    "Commission") requesting review of the Department's denial of
    their     reassessment         requests.        In     its        presentation        to    the
    Commission,       the    Department       argued      that    Stuyvesant         Dredging's
    activities         were         taxable      under           § 77.52(2)(a)10.,                or
    alternatively,          under     § 77.52(2)(a)11.             as     "processing"            of
    tangible personal property.               The Commission issued a Ruling and
    Order in favor of the Department.6                    Upholding the sales and use
    taxes,    the     Commission      concluded        that      "what     SDI     [Stuyvesant
    Dredging]     does      with    the   sediment        is    'processing . . . for              a
    consideration for consumers [Tetra Tech] who furnish directly or
    indirectly             the       materials            [sediment]               used          in
    the . . . processing'             under     the       meaning         of     Wis.          Stat.
    § 77.52(2)(a)11."               The    Commission            reasoned        that      "[t]he
    dictionary definition of 'processing' is 'to put through the
    steps    of   a   prescribed       procedure;        or,     to     prepare,     treat,       or
    convert by subjecting to a special process.' SDI's activities
    certainly fall within that definition."7
    ¶7       Tetra Tech and LFR Remediation timely filed a petition
    for judicial review, pursuant to Wis. Stat. § 227.52, in the
    6
    Tetra Tech and LFR Remediation's petitions received
    separate docket numbers (12-S-192 and 12-S-193, respectively),
    but the Commission decided the cases together.
    7
    See Processing, The American Heritage Dictionary 1444 (3d
    ed. 1992) (defining "processing" in relevant part:    "1. To put
    through the steps of a prescribed procedure," and as "2. To
    prepare, treat, or convert by subjecting to a special process").
    5
    No.      2015AP2019
    Brown County Circuit Court.                     The petition requested the circuit
    court    to      set    aside        the    Commission's         Ruling       and    Order       that
    Stuyvesant         Dredging's            work     subjected         Tetra     Tech       and     LFR
    Remediation to sales and use taxes.                          The circuit court affirmed,
    relying on the same definition of "processing" the Commission
    had used.          LFR Remediation and Tetra Tech appealed.                              The court
    of     appeals,        using     a       dictionary         definition       of     "processing"
    similar to the one used by the circuit court and the Commission,
    affirmed.         Tetra Tech EC, Inc. v. DOR, 
    2017 WI App 4
    , ¶¶2, 17,
    
    373 Wis. 2d 287
    , 
    890 N.W.2d 598
    .                          We granted Tetra Tech and LFR
    Remediation's petition for review, and now affirm.
    II.    DISCUSSION
    ¶8        The ultimate question we must answer in this case is
    whether the petitioners are subject to the tax levied on them by
    the      Department            of        Revenue           pursuant      to         Wis.        Stat.
    § 77.52(2)(a)11.              The Commission says they are, and urges us to
    agree with its interpretation and application of that statute.
    ¶9        Before we may answer that question, however, there is
    a     predicate        matter       we     must      address:         When     we       review    an
    administrative            agency's         decision,       are   there      circumstances          in
    which       we     must       defer      to     the       agency's     interpretation            and
    application of the law?                     Our current jurisprudence says there
    are.         And       ever     since         Harnischfeger         Corp.      v.       LIRC,     
    196 Wis. 2d 650
    , 659, 
    539 N.W.2d 98
    (1995), we have treated that
    deference         as    a     "standard         of       review."      Therefore,           because
    identifying the appropriate standard of review is an appellate
    court's first task, we will begin there.                              Once we resolve that
    6
    No.   2015AP2019
    issue,      we    will     address     the       interpretation        of     Wis.    Stat.
    § 77.52(2)(a)11.          and   how    it    applies      to   Tetra    Tech      and   LFR
    Remediation.
    A.     Deference to Administrative Agencies
    ¶10    Our assessment of the deference doctrine begins in the
    following section with a brief overview of its current contours.
    To truly understand its function, however, we need to search out
    its   roots,      the     results     of    which    we   discuss      in     the    second
    section.         As preparation for our comparison of the deference
    doctrine to our constitutional responsibilities, we examine in
    the third section the nature of the judiciary's powers and how
    they relate to the other governmental branches.                         In the fourth
    and fifth sections, we separately assess "great weight" and "due
    weight" deference in light of the constitutional provisions and
    principles that govern our work.
    1.    Current Standard for Reviewing Administrative Agency
    Decisions
    ¶11    We generally review administrative agency decisions in
    accordance with chapter 227 of our statutes.8                     As relevant here,
    Wis. Stat. § 227.57 contains two specific directions regarding
    how we are to conduct those reviews.                       First, it instructs a
    court to "set aside or modify the agency action if it finds that
    8
    This  decision   applies   to   judicial  review  of   all
    administrative agency decisions.    While chapter 227 applies to
    judicial review of most administrative decisions, it does not
    apply to all.     See, e.g., Wis. Stat. § 102.23 (establishing
    procedures for judicial review of workers compensation orders).
    7
    No.   2015AP2019
    the agency has erroneously interpreted a provision of law and a
    correct interpretation compels a particular action, or it shall
    remand the case to the agency for further action under a correct
    interpretation of the provision of law."                         § 227.57(5).      And
    second, it instructs that, "[s]ubject to sub. (11), upon such
    review due weight shall be accorded the experience, technical
    competence, and specialized knowledge of the agency involved, as
    well        as        discretionary      authority      conferred        upon    it."9
    § 227.57(10).
    ¶12       We     have    developed,       over   time,    a     contextualized
    methodology of reviewing administrative agency decisions.10                        The
    provenance of this methodology lies partly with the preceding
    statute, and partly with our own doctrinal developments.                        In its
    modern iteration, this method begins with the principle that
    "statutory        interpretation      is     a   question   of   law    which   courts
    decide de novo."           See 
    Harnischfeger, 196 Wis. 2d at 659
    .               And we
    recognize         that     "a    court     is     not   bound     by    an   agency's
    interpretation of a statute."                    
    Id. But then
    we wrap those
    principles within another, one we have said is of equal gravity:
    9
    Subsection 11 does not apply to the case before us today,
    but it will play a small part in our discussion below.      This
    subsection provides that "[u]pon review of an agency action or
    decision affecting a property owner's use of the property
    owner's property, the court shall accord no deference to the
    agency's interpretation of law if the agency action or decision
    restricts the property owner's free use of the property owner's
    property." Wis. Stat. § 227.57(11).
    10
    Whether, or how closely, our practice comports with the
    preceding statutory instructions will be addressed below.
    8
    No.    2015AP2019
    "As   important,       however,       is   the    principle       that   courts      should
    defer to an administrative agency's interpretation of a statute
    in certain situations."             
    Id. ¶13 Calibrating
            this      "deference           principle"     to        those
    "certain     situations"         resulted      in    our    contextualized,          three-
    tiered      treatment       of   an     administrative           agency's     conclusions
    regarding      the     interpretation          and     application       of     statutory
    provisions.          When    reviewing       those     conclusions,      we    give      them
    (1) great weight deference; (2) due weight deference; or (3) no
    deference at all.           See 
    id. at 659–60
    & n.4.
    ¶14    We      have    said      the     first       of    these——great        weight
    deference——is appropriate upon concluding that:
    (1) the agency was charged by the legislature with the
    duty of administering the statute; (2) . . . the
    interpretation of the agency is one of long-standing;
    (3) . . . the   agency  employed   its   expertise  or
    specialized knowledge in forming the interpretation;
    and (4) . . . the agency's interpretation will provide
    uniformity and consistency in the application of the
    statute.
    
    Id. at 660.
          Giving "great weight" to an administrative agency's
    interpretation means the court must adopt it so long as it is
    reasonable.       
    Id. at 661
    ("[W]e have repeatedly held that an
    agency's interpretation must then merely be reasonable for it to
    be sustained.").        An interpretation is reasonable if it does not
    "directly     contravene[]          the      words   of     the    statute,"        is    not
    "clearly contrary to legislative intent," and is not "without
    9
    No.    2015AP2019
    rational basis."           See 
    id. at 662.11
           Deference is required even
    when the court has a more reasonable interpretation of the law.
    Racine Harley-Davidson, Inc. v. Wis. Div. of Hearings & Appeals,
    
    2006 WI 86
    , ¶17, 
    292 Wis. 2d 549
    , 
    717 N.W.2d 184
    (stating that
    under great weight deference, a reviewing court must accept "an
    agency's reasonable statutory interpretation, even if the court
    concludes that another interpretation is equally reasonable, or
    even more reasonable, than that of the agency"); Crystal Lake
    Cheese Factory v. LIRC, 
    2003 WI 106
    , ¶24, 
    264 Wis. 2d 200
    , 
    664 N.W.2d 651
    ("This [the need to defer] is true even if the court
    were        to    conclude    that      another     interpretation          was   more
    reasonable.").          These   principles        also   apply   to   the    agency's
    application of the statute to undisputed facts, which is itself
    a question of law.12          See, e.g., Crystal Lake Cheese Factory, 
    264 Wis. 2d 200
    ,         ¶30     ("LIRC's     interpretations,        including        its
    determination of reasonable accommodation in this case, should
    be given 'great weight' deference.").
    ¶15       The second tier of review, "due weight" deference, is
    appropriate when "the statute is one that the agency was charged
    11
    In the context of an ambiguous statute, "an agency's
    interpretation cannot, by definition, be found to directly
    contravene it."   Harnischfeger Corp. v. LIRC, 
    196 Wis. 2d 650
    ,
    662, 
    539 N.W.2d 98
    (1995).
    12
    See DOR v. Exxon Corp., 
    90 Wis. 2d 700
    , 713, 
    281 N.W.2d 94
    (1979) ("The question of whether the facts fulfill a
    particular legal standard is itself a question of law.").
    10
    No.      2015AP2019
    with administering,"13 and "the agency has some experience in an
    area,      but   has    not     developed        the    expertise       which    necessarily
    places it in a better position to make judgments regarding the
    interpretation          of    the   statute       than     a    court."14        Under     this
    standard,        "the        fact   that     the        agency's        interpretation       is
    reasonable        does        not   mean         that     its      interpretation          will
    necessarily be upheld."              UFE Inc. v. LIRC, 
    201 Wis. 2d 274
    , 287,
    
    548 N.W.2d 57
          (1996).        Instead,          "[i]f      a    court     finds     an
    alternative interpretation more reasonable, it need not adopt
    the agency's interpretation."                    
    Id. In effect,
    this creates a
    "tie goes to the agency" rule in which deference is required
    unless the court's interpretation is more reasonable than that
    of the agency.          ABKA Ltd. P'ship v. DNR, 
    2002 WI 106
    , ¶116, 
    255 Wis. 2d 486
    ,       
    648 N.W.2d 854
        (Sykes,       J.,     dissenting)         ("[T]he
    agency's legal interpretation will be upheld even if there is a
    different, equally reasonable interpretation——in other words, a
    tie goes to the agency."); see also Daniel R. Suhr, Interpreting
    Wisconsin        Administrative            Law     at      7     (August        23,     2017),
    https://ssrn.com/abstract=3025085 ("Due weight might be called
    'tie goes to the agency' deference.").                         The agency's application
    of a statute to undisputed facts is also entitled to due weight
    13
    Operton v. LIRC, 
    2017 WI 46
    , ¶20, 
    375 Wis. 2d 1
    , 
    894 N.W.2d 426
    (quoting Racine Harley-Davidson, Inc. v. Wis. Div. of
    Hearings & Appeals, 
    2006 WI 86
    , ¶107, 
    292 Wis. 2d 549
    , 
    717 N.W.2d 184
    (Roggensack, J., concurring)).
    14
    UFE Inc. v. LIRC, 
    201 Wis. 2d 274
    , 286, 
    548 N.W.2d 57
    (1996).
    11
    No.     2015AP2019
    deference      when    it    satisfies    the        Harnischfeger     preconditions.
    See DOR v. A. O. Smith Harvestore Prods., Inc., 
    72 Wis. 2d 60
    ,
    65-66, 
    240 N.W.2d 357
    (1976) ("Due deference must be accorded
    the agency's application of the law to the found facts when the
    agency has particular competence or expertise in the matter at
    hand." (citing Wis. Stat. § 227.20(2) (1973))).
    ¶16      When conditions support neither great weight nor due
    weight deference, we give the administrative agency's statutory
    interpretation no deference at all.                   See Racine Harley-Davidson,
    Inc.,    
    292 Wis. 2d 549
    ,       ¶19.         In    those    circumstances,          "the
    reviewing court merely benefits from the agency's determination
    and     may    reverse      the   agency's      interpretation         even     when    an
    alternative statutory interpretation is equally reasonable to
    the interpretation of the agency."                   
    Id., ¶20. This
    is the same
    method    we    use    in   reviewing     questions       of   law    decided    by    our
    circuit courts and court of appeals.                   State v. Alger, 
    2015 WI 3
    ,
    ¶21, 
    360 Wis. 2d 193
    , 
    858 N.W.2d 346
    ("The interpretation and
    application of         a statute present questions of law that this
    court reviews de novo while benefitting from the analyses of the
    court of appeals and circuit court.").
    2.     History of the Deference Doctrine
    ¶17      Although we often speak of the deference doctrine in a
    manner that suggests it started and developed as a cohesive
    whole, it did not.           It is actually a portmanteau, derived from
    two different sources, the pieces of which developed over two
    different timelines, until they reached their fullest expression
    12
    No.    2015AP2019
    in Harnischfeger.         For purposes of clarity and ease of access,
    we will rehearse their histories separately.
    i.     A Brief History of "Great Weight" Deference
    ¶18     The road to Harnischfeger's "great weight deference"
    is a long one (it reaches as far back as Harrington v. Smith, 
    28 Wis. 43
    , 59-70 (1871)), but it is not an entirely clear one.                      As
    originally conceived, the doctrine did not contemplate deference
    at all, and it certainly did not purport to command the court's
    obedience.       But with time it developed into a decision-avoidance
    doctrine that left to the administrative agencies the job of
    statutory    interpretation     and    application      when     the     doctrine's
    preconditions      were   satisfied.        A   dozen   years    ago,     now-Chief
    Justice Patience Drake Roggensack did yeoman's work in tracing
    the development and effect of this doctrine.                See The Honorable
    Patience Drake Roggensack, Elected to Decide:                   Is the Decision-
    Avoidance Doctrine of Great Weight Deference Appropriate in This
    Court of Last Resort?, 89 Marq. L. Rev. 541, 548-60 (2006).                       The
    following history relies heavily on that scholarship.
    ¶19     In    Harrington,   we    discussed     some   of    the     canons   of
    construction we used in discerning the proper meaning of an
    ambiguous statute.         One of those canons says that an agency's
    understanding of the statute could be probative of its meaning:
    "Long and uninterrupted practice under a statute, especially by
    the officers whose duty it was to execute it, is good evidence
    of its construction, and such practical construction will be
    13
    No.      2015AP2019
    adhered to, even though, were it res integra,[15] it might be
    difficult to maintain it."                   
    Harrington, 28 Wis. at 68
    .                   The
    practice        of    executive     branch    employees         "extending     through      a
    period     of    so    many    years,    ought,     it    would    seem,     to    be    some
    evidence of what the law is; and some persons might be disposed,
    perhaps, to think, evidence equal to a decision of this court."
    
    Id. at 69.
              "Great weight," we concluded, "is undoubtedly to be
    attached to a construction which has thus been given."                            
    Id. ¶20 This
       is    not    the     language      of     deference,       but    of
    persuasion.          In a search for the proper meaning of an ambiguous
    statute, we said we could properly have recourse to the views of
    others and treat them as pieces of evidence for use in the
    process of statutory construction in which we ourselves were
    engaged.         In support of our statement about the evidentiary
    nature     of    the    executive       employees'       views,    we   cited      Edwards'
    Lessee v. Darby, 25 U.S. (12 Wheat.) 206, 210 (1827).                               There,
    the United States Supreme Court said that "[i]n the construction
    of    a     doubtful          and   ambiguous        law,       the     contemporaneous
    construction of those who were called upon to act under the law,
    and   were      appointed      to   carry     its   provisions        into     effect,    is
    15
    "Res integra" means, literally, "an entire thing."   Res
    Integra, Black's Law Dictionary (10th ed. 2014) (citing Res
    Nova, id.).   Typically, the phrase refers to a matter of first
    impression.   See Res Integra, Black's Law Dictionary (10th ed.
    2014); see also Res Nova, 
    id. (stating that
    res nova is also
    termed res integra, and defining res nova as a "case of first
    impression").
    14
    No.        2015AP2019
    entitled     to    very     great   respect."          
    Id. One may
        respect     an
    interpretation, even greatly, without deferring to it.
    ¶21    Nor      was     Harrington        expressing      deference           to    an
    administrative        agency    when   it       said    we   would    adhere        to   the
    executive branch's long-standing interpretation of a statute.
    Instead,     we    were     acknowledging       that    a    change   in      an    ancient
    practice could have unacceptably disruptive consequences.                                For
    this principle we cited Rogers v. Goodwin, in which the Supreme
    Judicial Court of Massachusetts said:
    Were the Court now to decide that this construction is
    not to be supported, very great mischief would follow.
    And although, if it were now res integra,[16] it might
    be very difficult to maintain such a construction, yet
    at this day the argumentum ab inconvenienti[17] applies
    with great weight. We cannot shake a principle which
    in practice has so long and so extensively prevailed.
    If the practice originated in error, yet the error is
    now so common that it must have the force of law.
    2 Mass. (2 Tyng) 475, 477–78 (Mass. 1807).
    ¶22    Harrington cast a long shadow.                  The court was content
    for   many    years    to    repeat    and      apply    its   formulation          without
    reading deference into its language.                    See, e.g., State ex rel.
    Owen v. Donald, 
    160 Wis. 21
    , 111, 
    151 N.W. 331
    (1915) (quoting
    Harrington, and stating long practice is evidence of meaning);
    State ex rel. State Ass'n of Y.M.C.A. of Wis. v. Richardson, 197
    16
    See supra n.15.
    17
    "Argumentum ab inconvenienti" means "[a]n argument from
    inconvenience;   an   argument  that   emphasizes   the harmful
    consequences of failing to follow the position advocated."
    Argumentum, Black's Law Dictionary (10th ed. 2014).
    15
    No.     2015AP2019
    Wis. 390, 393, 
    222 N.W. 222
    (1928) ("If we were in doubt as to
    the proper construction to be placed upon the statute, we should
    have to give much weight to the practical construction which has
    been placed upon the statute ever since its enactment."); Wis.
    Axle    Div.       (Timken-Detroit             Axle    Co.)    v.    Indus.       Comm'n,       
    263 Wis. 529
    , 537b, 
    60 N.W.2d 383
    (1953) (per curiam) ("This court
    has held that where there is any obscurity in the meaning of a
    statute,      practical       construction             given    by    the       administrative
    agency charged with administering such law is entitled to great
    weight."); Trczyniewski v. City of Milwaukee, 
    15 Wis. 2d 236
    ,
    240, 
    112 N.W.2d 725
    (1961) (same).                          As Justice Rebecca Bradley
    recently      observed,       "[b]y       recognizing          the   value       of    executive
    interpretations without entirely ceding interpretive authority
    to    the    executive,      these        older       cases    reflect      a    more    nuanced
    appreciation           for         judicial             interaction             with      agency
    interpretation . . . ."                  Operton v. LIRC, 
    2017 WI 46
    , ¶78, 
    375 Wis. 2d 1
    , 
    894 N.W.2d 426
    (R. Grassl Bradley, J., concurring).
    ¶23     But    then        came    Pabst        v.     Wisconsin         Department      of
    Taxation,      
    19 Wis. 2d 313
    ,         
    120 N.W.2d 77
         (1963).           There,   we
    started      our     analysis      of     an    agency's       statutory        interpretation
    with the proposition that "[e]rrors of law are always reviewable
    by the reviewing court."                       
    Id. at 322.
              But in our extended
    discussion of the nature of that review, we did something new.
    We imported the concept of deference.                         Federal courts, we noted,
    afforded deference to an administrative agency's application of
    a statute to undisputed facts under certain circumstances.                                      See
    
    id. at 322-24.
            In    determining          "whether      the       administrative
    16
    No.    2015AP2019
    agency has correctly applied a statute to certain facts," the
    federal courts would employ either the "analytical approach" or
    the "practical approach."             See 
    id. at 322.
    ¶24     Under     the    analytical          approach,       "the       court     decides
    which part of the agency's determination presents a question of
    fact and which part a question of law."                               
    Id. As Professor
    Kenneth Culp Davis described this methodology, the court upholds
    the agency's factual findings if they have a reasonable basis.
    4   Kenneth    Culp        Davis,    Administrative             Law     Treatise       § 30.01
    (1958).       But    with     respect       to    questions       of        law,    the     court
    substitutes     its        judgment     for       that     of     the        agency.          
    Id. Essentially, this
       creates     a   de     novo    standard          for    reviewing
    questions of law.
    ¶25     The practical approach treats the agency's decision
    more like legislation than adjudication.                        It avoids any attempt
    to distinguish between facts and law, and instead holds that
    "[t]he judicial function is exhausted when there is found to be
    a   rational        basis     for     the        conclusions          approved         by    the
    administrative        body."         
    Pabst, 19 Wis. 2d at 323
       (quoting
    Rochester     Tel.     Corp.    v.     United          States,        
    307 U.S. 125
    ,        146
    (1939)).18
    18
    The practical approach is very similar to the "rational
    basis" standard of review we apply to legislation. See Blake v.
    Jossart, 
    2016 WI 57
    , ¶31, 
    370 Wis. 2d 1
    , 
    884 N.W.2d 484
    (indicating that under rational basis review, "[i]n cases where
    a statutory classification does not involve a suspect class or a
    fundamental interest, the classification will be upheld if there
    is any rational basis to support it" (quoting State v. Burgess,
    
    2003 WI 71
    , ¶10, 
    262 Wis. 2d 354
    , 
    665 N.W.2d 124
    )).
    17
    No.    2015AP2019
    ¶26   Pabst observed that the method of review chosen by the
    court   would     be   outcome-determinative         with    respect      to    whose
    application of the statute would control the case:                      "[Professor
    Davis] concludes that the court applies the analytical approach
    when it does not wish to be bound by the agency's application of
    a statute to a set of facts, and the practical approach when it
    believes the agency's application of the law should be deferred
    to."    
    Pabst, 19 Wis. 2d at 323
    .            The primary factor driving the
    selection of the review method, Professor Davis believed, was
    the agency's expertise:
    Davis believes that one of the most-important factors
    which influences the court's choice of approach in
    this field is the comparative qualification of court
    and agency to decide the particular issue. The court
    often deems agencies and their staffs to be expert
    within their own specialized fields.          In such
    situations, the practical approach is likely to be
    employed rather than the analytical in determining the
    scope of review to be applied.
    
    Id. (citing Davis,
      supra    ¶24, at    § 30.01      et seq. (Professor
    Kenneth Culp Davis, University of Chicago School of Law and
    University    of    San    Diego    School    of   Law)).         The    "practical
    approach"     bears    a   close    resemblance      to     the   "great       weight
    deference" formulation.            It also reaches the same result, to
    wit, preference for the agency's conclusion of law over that of
    the court.
    ¶27   We   concluded    in    Pabst    that    the    statutes      as    they
    existed at the time bound us to use the analytical approach.
    18
    No.    2015AP2019
    "We believe that pars. (b) and (d) of sec. 227.20(1), Stats.,[19]
    require Wisconsin courts to employ the analytical approach when
    reviewing agency decisions."            
    Pabst, 19 Wis. 2d at 323
    .        But we
    also    said    that   dividing   the    facts   from    the   law    would   not
    necessarily       prevent   us    from       deferring    to    the    agency's
    application of the statute (i.e., the practical approach):
    Nevertheless, in fields in which an agency has
    particular competence or expertise, the courts should
    not substitute their judgment for the agency's
    application of a particular statute to the found facts
    if a rational basis exists in law for the agency's
    interpretation and it does not conflict with the
    statute's legislative history, prior decisions of this
    court, or constitutional prohibitions.
    
    Id. at 323-24.
    19
    At the time, Wis. Stat. § 227.20(1) (1961) provided, in
    part:
    The court may affirm the decision of the agency, or
    may reverse or modify it if the substantial rights of
    the appellant have been prejudiced as a result of the
    administrative findings, inferences, conclusions or
    decisions being:
    . . . .
    (b)   In   excess  of  the   statutory   authority  or
    jurisdiction of the agency, or affected by other error
    of law; or
    . . . .
    (d) Unsupported by substantial evidence in view of the
    entire record as submitted; . . . .
    § 227.20(1)(b), (d) (1961).
    19
    No.       2015AP2019
    ¶28     We     used     the        analytical     approach            in     Pabst,       in
    accordance with statutory requirements,20 but only because we did
    not "deem the board more competent than this court to decide a
    question of law involving trust administration."                                   See 
    id. at 324.
            Subsequent       cases       confirm    that    our     commitment          to     the
    analytical approach has always been more nominal than real.                                     For
    example, in DOR v. Exxon Corp., we said:
    While this court has held that ch. 227, Stats.
    requires that courts employ the "analytical" approach
    when reviewing agency decisions, this court will give
    deference to agency determinations, where the agency
    has particular expertise, rational basis exists in law
    for the agency's interpretation, and it does not
    conflict with the statute's legislative history, prior
    decisions    of   this   court,    or   constitutional
    prohibitions.
    
    90 Wis. 2d 700
    ,       713,       
    281 N.W.2d 94
       (1979)       (citing           
    Pabst, 19 Wis. 2d at 323
    -24), aff'd, 
    447 U.S. 207
    (1980).                              So although the
    statutes      require     a    de     novo   review     of   questions            of    law   (the
    analytical        approach),        we     have   deferred      to      an    administrative
    agency (the practical approach) when circumstances satisfied our
    criteria.
    ¶29     Where we once treated an agency's interpretation of a
    statute as evidence of its meaning (Harrington), Pabst put us in
    a posture of deference to administrative agencies.                                     The shift
    was    not    a     comfortable       one,   as     evidenced      by    a    sporadic,         but
    short-lived, return to a more Harrington-like understanding of
    "great weight."           See Mednis v. Indus. Comm'n, 
    27 Wis. 2d 439
    ,
    20
    Wis. Stat. § 227.20(1)(b), (d) (1961).
    20
    No.      2015AP2019
    444, 
    134 N.W.2d 416
    (1965) ("The construction and interpretation
    adopted by the administrative agency charged with the duty of
    applying the law is entitled to great weight in the courts.");
    see   also     Cook    v.     Indus.       Comm'n,   
    31 Wis. 2d 232
    ,          240,   
    142 N.W.2d 827
    (1966) (same).               Each of these cases relied on pre-
    Pabst       authorities,       such     as     Wisconsin        Axle   Division         and
    Trczyniewski,21 in which the agencies' understanding of the law
    assisted,      but    did    not     supplant,     our    own   application        of   the
    statutes.
    ¶30     When     we      eventually          circled      back        to     Pabst's
    understanding         of    "great     weight,"      we    granted     administrative
    agencies even broader deference than they had enjoyed before.
    See 
    Roggensack, supra
    ¶18, at 558-59.                     Whereas Pabst called for
    deference      only    to     an   agency's       application     of   a     statute    to
    undisputed facts, we extended that deference to the construction
    of    the    statute        itself    in     Bucyrus-Erie       Co.    v.     DILHR,     
    90 Wis. 2d 408
    , 417, 
    280 N.W.2d 142
    (1979).                     There, we acknowledged
    that "questions of law are always reviewable by the court," and
    that "[t]he construction of a statute or the application of a
    statute to a particular set of facts is such a question of law."
    
    Id. But when
    we applied the Pabst deference principle, we made
    no distinction between interpreting a statute and applying it.
    21
    Trczyniewski v. City of Milwaukee, 
    15 Wis. 2d 236
    , 240,
    
    112 N.W.2d 725
    (1961); Wis. Axle Div. (Timken-Detroit Axle Co.)
    v. Indus. Comm'n, 
    263 Wis. 529
    , 537b, 
    60 N.W.2d 383
    (1953) (per
    curiam).
    21
    No.     2015AP2019
    We    acknowledged   the     case     "involve[d]         the       interpretation         and
    application of certain statutory provisions," but then said:
    The court will hesitate to substitute its judgment for
    that of the agency on a question of law if " . . . a
    rational basis exists in law for the agency's
    interpretation and it does not conflict with the
    statute's legislative history, prior decisions of this
    court, or constitutional prohibitions."
    Bucyrus-Erie 
    Co., 90 Wis. 2d at 411
    ,     417    (quoting         
    Pabst, 19 Wis. 2d at 323
    -24).         After Bucyrus-Erie Co., we never returned
    to    Harrington's     formulation       that      an    administrative            agency's
    application of a statute was evidence of its meaning that the
    court could accept or reject in the process of authoritatively
    resolving     questions    of    law.     By       expanding        the    reach    of     the
    deference principle, "the court continued a trend of applying
    great weight deference more and more often, thereby construing
    statutes less and less frequently."                     
    Roggensack, supra
    ¶18, at
    556.
    ¶31   Only one transformation remains before we reach the
    current      expression     of   the     deference         doctrine.             Prior      to
    Harnischfeger, we treated deference to administrative agencies
    as a choice, something the courts could do in the process of
    interpreting and applying a statute, but were not required to
    do.    Just a few years before we decided Harnischfeger, we said:
    "The interpretation of a statute presents a question of law, and
    the    'blackletter'      rule   is    that    a    court      is    not    bound     by    an
    agency's interpretation.              Courts, however, frequently refrain
    from substituting their interpretation of a statute for that of
    the agency charged with the administration of a law."                            Lisney v.
    22
    No.   2015AP2019
    LIRC, 
    171 Wis. 2d 499
    , 505, 
    493 N.W.2d 14
    (1992).             "Frequently
    refrain" describes something episodic, not a rule of uniform
    application.       It implies the court will decide, on a case-by-
    case basis, whether to defer to the administrative agency as it
    resolves questions of law.
    ¶32   Harnischfeger, however, made the deference doctrine a
    systematic requirement upon satisfaction of its preconditions.
    See 
    Roggensack, supra
    ¶18, at 553.         It accomplished this feat by
    promoting deference from a canon of construction to a standard
    of review:        "Whether or not a court agrees or disagrees with
    LIRC's methodology, however, is not the issue in this case.
    Instead, the central question is what standard of review the
    courts of this state should apply when called upon to evaluate
    an agency's interpretation of a statute."              
    Harnischfeger, 196 Wis. 2d at 659
    .22      We then identified "great weight" deference,
    "due    weight"    deference,   and   no   deference   as   the   available
    options.     
    Id. at 659-60.
         Determining the correct standard of
    review, of course, is something an appellate court does at the
    22
    "In setting the frame for broad deference to agencies,
    the court [in Harnischfeger] described the legal issue before
    the court as deciding what level of deference it should accord
    LIRC's decision. It did not characterize the legal issue as the
    interpretation of an ambiguous statute." The Honorable Patience
    Drake Roggensack, Elected to Decide: Is the Decision-Avoidance
    Doctrine of Great Weight Deference Appropriate in This Court of
    Last Resort?, 89 Marq. L. Rev. 541, 553 (2006).
    23
    No.   2015AP2019
    very beginning of its work, and it definitively controls how we
    address questions of both fact and law.23
    ¶33    Enshrining this doctrine as a standard of review bakes
    deference into the structure of our analysis as a controlling
    principle.       By the time we reach the questions of law we are
    supposed to review, that structure leaves us with no choice but
    to defer if the preconditions are met.                  
    Id. at 663
    ("When, as in
    this    case,     great   weight         deference     is    appropriate        and   the
    agency's      interpretation        is    not    otherwise        unreasonable,       'the
    court of appeals and this court should refrain from substituting
    their       interpretation     of    [a]     statute        for   the     long-standing
    interpretation of the agency charged with its administration.'"
    (quoted source omitted) (emphasis omitted)).                      Harnischfeger made
    good    on    this   premise   by    reversing       the     court   of    appeals    for
    failing to defer to the administrative agency.                          Our subsequent
    cases make it clear we understand the mandatory nature of the
    deference doctrine.          See, e.g., Crystal Lake Cheese Factory, 
    264 Wis. 2d 200
    , ¶52 ("As we have determined LIRC's interpretation
    to be reasonable, under the 'great weight' standard of review,
    
    23 Utah v
    . Thurman, 
    846 P.2d 1256
    , 1265-66 (Utah 1993) ("It
    is widely agreed that the primary function of a standard of
    review is to apportion power and, consequently, responsibility
    between trial and appellate courts for determining an issue or a
    class of issues. . . . In determining the appropriateness of a
    particular allocation of responsibility for deciding an issue or
    a class of issues, account should be taken of the relative
    capabilities of each level of the court system to take evidence
    and make findings of fact in the face of conflicting evidence,
    on the one hand, and to set binding jurisdiction-wide policy, on
    the other." (internal citations omitted)).
    24
    No.    2015AP2019
    we    must,    therefore,    defer   to      LIRC's   conclusion."        (emphasis
    added)).
    ii.   A Brief History of "Due Weight" Deference
    ¶34    "Due weight deference" is of a much younger vintage
    than "great weight deference."            It also has a different source.
    Whereas the latter developed as a home-grown doctrine within the
    judiciary, the former has its roots in our statutes.                      In 1943,
    our   legislature      adopted   Wis.     Stat.    § 227.20(2)     (subsequently
    renumbered to § 227.57(10)), which read:               "Upon such review due
    weight shall be accorded the experience, technical competence,
    and specialized knowledge of the agency involved, as well as
    discretionary authority conferred upon it."24
    ¶35    Our   first   opportunity      to   engage    with   that    language
    came in Ray-O-Vac Co. v. Wisconsin Employment Relations Board,
    
    249 Wis. 112
    , 119, 
    23 N.W.2d 489
    (1946).                   There, the Wisconsin
    Employment Relations Board asserted:
    [O]n a review of the board's findings, the court has
    no jurisdiction to determine the factual issues anew
    if there is some evidence before the board reasonably
    tending to support a finding, and "the court may not
    weigh   the   evidence   to    ascertain   whether it
    preponderates in favor of the finding" . . . ; or
    substitute its judgment for that of the board even
    though the court might have decided the question
    differently had it been before the court de novo.
    
    Id. (internal citation
    omitted).
    24
    Wis. Stat. § 227.20(2) (1943); see § 1, ch. 375, Laws of
    1943 (creating § 227.20(2)); see also § 24, ch. 414, Laws of
    1975 (renumbering); 1985 Wis. Act 182, § 41 (renumbering again).
    25
    No.    2015AP2019
    ¶36     We agreed with the Board, noting that "[i]n relation
    to a court review of the board's findings and orders it must be
    noted that there is applicable thereto" the terms of Wis. Stat.
    § 227.20(2) (1943).           Ray-O-Vac 
    Co., 249 Wis. at 119-20
    .               The
    court's reference to the Board's orders (in                    addition to its
    findings)     suggests    the     court   gave   "due   weight . . . [to]      the
    experience, technical competence, and specialized knowledge of
    the agency involved," see § 227.20(2) (1943), as it reviewed the
    Board's conclusions of law as well.                This is probable because
    the   court    relied    on   a   separate     source   of   authority   for   the
    proposition that it must defer to the Board's findings of fact.
    It cited Wisconsin Labor Relations Board v. Fred Rueping Leather
    Co., which held:
    [I]f th[e] evidence supports the finding of the
    industrial commission, the finding must stand.     The
    Wisconsin Labor Relations Act in sec. 111.10 (5), Wis.
    Stats., provides what is lacking in the Workmen's
    Compensation Act, namely, an implied authorization to
    the courts to review the facts, coupled with the
    express provision that the findings, "if supported by
    evidence in the record," shall be conclusive.
    
    228 Wis. 473
    , 494, 
    279 N.W. 673
    (1938).25
    25
    We were, perhaps, even more enigmatic with respect to the
    doctrine's application to questions of law in Milwaukee Electric
    Railway & Transport Co. v. Public Service Commission, 
    261 Wis. 299
    , 302–03, 
    52 N.W.2d 876
    (1952).   There, we said "[t]he
    court must also recognize that the commission has expert
    knowledge, that such knowledge may be applied by it, and that
    even though we might differ with the commission, we are without
    power to substitute our views of what may be reasonable."    
    Id. In the
    next sentence, however, we said only that "[w]e may not
    disturb the commission's findings," which is a reference only to
    the facts that the agency found. See 
    id. at 303.
    26
    No.    2015AP2019
    ¶37    We were not any more specific about how "due weight"
    consideration     affects        conclusions    of    law     when     we    decided
    Muskego-Norway Consolidated Schools Joint School District No. 9
    v.   Wisconsin   Employment       Relations    Board,    
    35 Wis. 2d 540
    ,         
    151 N.W.2d 617
    (1967).        But we did frame the statute's provision in
    terms of "deference":
    [I]n this court's judicial review we are not required
    to agree in every detail with the WERB as to its
    findings,   conclusions    and   order. . . . Sec[tion]
    227.20 (2), Stats., requires that upon such review due
    weight shall be accorded the experience, technical
    competence, and specialized knowledge of the agency
    involved.   In short, this means the court must make
    some deference to the expertise of the agency.
    Muskego-Norway Consol. Sch. Joint Sch. Dist. No. 
    9, 35 Wis. 2d at 562
    .      We applied the statute's "due weight" mandate to the
    Board's findings and conclusions of law without differentiation.
    "Some deference" was due, we said, but we did not say how that
    should be applied or quantified.
    ¶38    We were a little more direct on this topic in Vivian
    v.   Examining     Board    of     Architects,       Professional          Engineers,
    Designers and Land Surveyors, in which we reviewed the Board's
    determination of whether the defendant's conduct could satisfy a
    "gross      negligence"    standard.           
    61 Wis. 2d 627
    ,          638,    
    213 N.W.2d 359
        (1974).      We    strongly     implied   that    the       Board   was
    qualified not just to apply that standard, but to define it as
    well:
    The legislative command that due weight is to be given
    to   "the   experience,   technical  competence,   and
    specialized knowledge of the agency involved," in
    determining what is gross negligence, indicates the
    27
    No.    2015AP2019
    determination of the grossness of the negligence is to
    be made by those knowledgeable as to the particular
    profession involved.
    
    Id. (emphasis added)
    (quoting Wis. Stat. § 227.20(2) (1971)).
    ¶39   A    few      years    later,   we    stated       explicitly       that   Wis.
    Stat. § 227.20(2) (1973) applies to an administrative agency's
    legal conclusions.            And we described deference as a requirement
    when its preconditions were met.                     In A. O. Smith Harvestore
    Products, Inc., we acknowledged that "[t]his court has uniformly
    held that whether or not the facts found fulfill a particular
    legal standard is a question of law, not a question of 
    fact." 72 Wis. 2d at 65
    .                 And then we said that under § 227.20(2)
    (1973),      "[d]ue        deference       must     be        accorded     the    agency's
    application of the law to the found facts when the agency has
    particular       competence        or    expertise       in    the   matter      at   hand."
    A. O.     Smith       Harvestore        Prods.,    
    Inc., 72 Wis. 2d at 65-66
    (emphasis added) (citing § 227.20(2) (1973)).
    ¶40   As       we   mentioned      above,     Harnischfeger         elevated       the
    deference doctrine from a canon of construction to a standard of
    review.      "Whether or not a court agrees or disagrees with LIRC's
    methodology, however, is not the issue in this case.                              Instead,
    the central question is what standard of review the courts of
    this state should apply when called upon to evaluate an agency's
    interpretation of a statute."                     
    Harnischfeger, 196 Wis. 2d at 659
    .      So,     just     like    "great    weight"      deference,       "due       weight"
    deference       has    become      an   integral,    and       therefore    unavoidable,
    part of the framework within which we review an administrative
    agency's conclusions of law.
    28
    No.     2015AP2019
    ¶41       Fortified             by         this        history       of         our      deference
    jurisprudence,            we    can       now    determine          whether     the        doctrine    is
    consistent with the judiciary's constitutional responsibility.26
    3.    The Judiciary's Constitutional Responsibilities
    ¶42       As     the      deference             doctrine     developed,          we     recognized
    that its operation allowed the executive branch of government to
    authoritatively             decide         questions         of     law    in        specific       cases
    brought    to       our     courts        for        resolution.          But    nowhere        in    the
    journey        from       Harrington            to     Harnischfeger           did     we     determine
    whether this was consistent with the allocation of governmental
    power amongst the three branches.                               So, as a matter of first
    impression,          we     consider            whether       our     deference            doctrine    is
    compatible          with       our    constitution's              grant     of       power     to     the
    judiciary:
    The judicial power of this state shall be vested in a
    unified court system consisting of one supreme court,
    a court of appeals, a circuit court, such trial courts
    of general uniform statewide jurisdiction as the
    legislature may create by law, and a municipal court
    if authorized by the legislature under section 14.
    Wis. Const. art. VII, § 2.                       It is, perhaps, tautological to say
    that the judicial power should reside in the judiciary.                                         But the
    26
    
    Roggensack, supra
    n.22, at 542 ("[B]ecause the Wisconsin
    Supreme Court's members were elected to decide what the law is,
    and because the court restricts its own docket in order to
    maintain its law-declaring status, it [is] appropriate for the
    court to re-examine whether decision-avoidance is too often
    replacing the court's full consideration of the issues raised on
    appeal, at least in regard to state agency decisions to which
    the highest level of deference, great weight deference, is
    accorded.").
    29
    No.    2015AP2019
    constitution does not define what that term comprises, nor does
    it   explicitly      describe     how    that       power   relates     to    the   other
    branches of government.27
    ¶43     Allowing an administrative agency to authoritatively
    interpret     the    law    raises     the    possibility       that    our   deference
    doctrine has allowed some part of the state's judicial power to
    take up residence in the executive branch of government.                              To
    discover whether it did, we must first get our bearings on the
    nature and extent of judicial power.                    We had occasion to dwell
    on this subject at some length just last term.                          See generally
    Gabler v. Crime Victims Rights Bd., 
    2017 WI 67
    , 
    376 Wis. 2d 147
    ,
    
    897 N.W.2d 384
    .           There is no need to recreate Gabler's thorough
    analysis, so we will content ourselves with referencing only
    those parts that illuminate our work here.
    ¶44     The    "separation        of    powers"       doctrine     informs     our
    understanding        of    how   the   constitution         allocates    governmental
    power      amongst    its    constituent          branches.28     This       fundamental
    principle of American constitutional government was "established
    at the founding of our nation and enshrined in the structure of
    27
    "This   court    has  recognized,  however,   that   the
    constitution does not define legislative, executive or judicial
    power . . . ."    State v. Holmes, 
    106 Wis. 2d 31
    , 42–43, 
    315 N.W.2d 703
    (1982).
    28
    The executive and legislative branches have their own
    explicit grants of power under our constitution.   Wis. Const.
    art. V, § 1 (providing that "[t]he executive power shall be
    vested in a governor"); Wis. Const. art. IV, § 1 (stating that
    "[t]he legislative power shall be vested in a senate and
    assembly").
    30
    No.     2015AP2019
    the     United           States        Constitution,"             and        "inform[s]       our
    understanding of the separation of powers under the Wisconsin
    Constitution."            Gabler, 
    376 Wis. 2d 147
    , ¶11; Flynn v. DOA, 
    216 Wis. 2d 521
    ,            545,    
    576 N.W.2d 245
              (1998)     ("The    doctrine      of
    separation         of    powers       is    implicitly         found    in    the     tripartite
    division      of    government         [among]         the    judicial,       legislative     and
    executive branches."); Goodland v. Zimmerman, 
    243 Wis. 459
    , 466-
    67, 
    10 N.W.2d 180
    (1943) ("It must always be remembered that one
    of    the    fundamental         principles        of    the     American       constitutional
    system is that governmental powers are divided among the three
    departments of government, the legislative, the executive, and
    judicial, and that each of these departments is separate and
    independent from the others except as otherwise provided by the
    constitution."); Rules of Court Case, 
    204 Wis. 501
    , 503, 
    236 N.W. 717
         (1931)          ("It    is,   of    course,       elementary       that    we   are
    committed      by       constitution         to   the        doctrine    of     separation     of
    powers.").
    ¶45    We must be assiduous in patrolling the borders between
    the branches.            This is not just a practical matter of efficient
    and effective government.                   We maintain this separation because
    it provides structural protection against depredations on our
    liberties.              The    Framers      of    the        United    States    Constitution
    understood that "[t]he accumulation of all powers legislative,
    executive and judiciary in the same hands, whether of one, a few
    or many, . . . may justly be pronounced the very definition of
    tyranny."       The Federalist No. 47, at 324 (James Madison) (Jacob
    Cooke ed., 1961).                Consequently, "[a]s Madison explained when
    31
    No.     2015AP2019
    advocating    for   the     Constitution's        adoption,          neither      the
    legislature   nor   the   executive        nor   the    judiciary        'ought    to
    possess, directly or indirectly, an overruling influence over
    the others in the administration of their respective powers.'"
    Gabler, 
    376 Wis. 2d 147
    , ¶4 (quoting The Federalist No. 48, at
    305 (James Madison) (Clinton Rossiter ed., 1961)).                   "The purpose
    of the separation and equilibration of powers in general," said
    Justice   Antonin   Scalia,   "was    not    merely     to    assure      effective
    government but to preserve individual freedom."29                     Morrison v.
    Olson, 
    487 U.S. 654
    , 727 (1988) (Scalia, J., dissenting).                          To
    this day, "[a]fter more than two hundred years of constitutional
    governance,    th[is]     tripartite         separation       of      independent
    governmental power remains the bedrock of the structure by which
    we secure liberty in both Wisconsin and the United States."
    Gabler, 
    376 Wis. 2d 147
    , ¶3.           As United States Supreme Court
    Justice   Joseph    Story     said,    "the      three       great       powers    of
    government . . . should for ever be kept separate and distinct."
    
    Id. (quoting 2
    Joseph Story, Commentaries on the Constitution of
    the United States § 519, at 2-3 (Boston:               Hilliard, Gray, & Co.,
    1833)).
    29
    See also Youngstown Sheet & Tube Co. v. Sawyer, 
    343 U.S. 579
    , 635 (1952) (Jackson, J., concurring) (stating that "the
    Constitution diffuses power the better to secure liberty").
    Centuries earlier, the French writer Montesquieu said "there is
    no liberty, if the judiciary power be not separated from the
    legislative and executive."    Charles de Secondat Montesquieu,
    The Spirit of Laws bk. XI, at 152 (Thomas Nugent trans., The
    Colonial Press rev. ed. 1900) (1748).
    32
    No.    2015AP2019
    ¶46     The constitution does not, however, hermetically seal
    the branches from each other.                 The separation of powers doctrine
    "envisions a system of separate branches sharing many powers
    while     jealously           guarding       certain           others,     a      system       of
    'separateness but interdependence, autonomy but reciprocity.'"
    State ex rel. Friedrich v. Circuit Court for Dane Cty., 
    192 Wis. 2d 1
    , 14, 
    531 N.W.2d 32
    (1995) (quoting Youngstown Sheet &
    Tube    Co.    v.     Sawyer,    
    343 U.S. 579
    ,       635     (1952)    (Jackson,         J.,
    concurring)).           "The    constitutional           powers      of    each      branch    of
    government       fall    into       two   categories:             exclusive       powers      and
    shared    powers."            State    v.    Horn,       
    226 Wis. 2d 637
    ,        643,     
    594 N.W.2d 772
    (1999).             "Shared powers lie at the intersections of
    these     exclusive       core        constitutional           powers,"        and    "[t]hese
    '[g]reat borderlands of power'                     are not exclusive to any one
    branch."       
    Id. at 643-44
    (quoting 
    Friedrich, 192 Wis. 2d at 14
    );
    see also State v. Holmes, 
    106 Wis. 2d 31
    , 42–43, 
    315 N.W.2d 703
    (1982).        Although       the     "branches      may       exercise    [shared]      power
    within    these       borderlands,"         they    "may       [not]     unduly      burden    or
    substantially interfere with another branch."                            
    Horn, 226 Wis. 2d at 644
    .
    ¶47     Core    powers,      however,       are     not    for     sharing.       "Each
    branch has exclusive core constitutional powers, into which the
    other branches may not intrude."                      
    Flynn, 216 Wis. 2d at 545
    .
    "For more than a century, this court has been called upon to
    resist    attempts       by    other      branches       of     government      to    exercise
    authority in an exclusively judicial area."                               In re Complaint
    Against       Grady,    
    118 Wis. 2d 762
    ,        778,       
    348 N.W.2d 559
         (1984).
    33
    No.    2015AP2019
    These "[c]ore zones of authority are to be 'jealously guarded'
    by each branch of government, . . . ."                         Gabler, 
    376 Wis. 2d 147
    ,
    ¶31 (quoting Barland v. Eau Claire Cty., 
    216 Wis. 2d 560
    , 573,
    
    575 N.W.2d 691
            (1998)).           The     importance        of     constitutional
    limitations,         Chief       Justice    Marshall         once     said,    is    that   they
    compel       restraint       when     restraint        is    not    desired:          "To   what
    purpose       are    powers       limited,       and    to      what     purpose      is    that
    limitation committed to writing, if these limits may, at any
    time, be passed by those intended to be restrained?"                                 Marbury v.
    Madison, 5 U.S. (1 Cranch) 137, 176 (1803).
    ¶48     The separation of powers prevents us from abdicating
    core    power       just    as    much     as   it     protects       the     judiciary     from
    encroachment by other branches.                        "It is . . . fundamental and
    undeniable that no one of the three branches of government can
    effectively         delegate       any   of     the    powers       which     peculiarly     and
    intrinsically belong to that branch."                         Rules of Court 
    Case, 204 Wis. at 503
    ; see also 
    id. (stating that
    "any attempt to abdicate
    [a core power] in any particular field, though valid in form,
    must,     necessarily,           be   held      void"        (internal        quotation     mark
    omitted)       (quoting       State      ex     rel.        Mueller    v.     Thompson,      
    149 Wis. 488
    , 491-92, 
    137 N.W. 20
    (1912))).                        Even if we truly wished
    to abandon some aspect of our core power, no other branch may
    take it up and use it as its own.                              "As to these areas of
    authority, . . . any exercise of authority by another branch of
    government is unconstitutional."                       Gabler, 
    376 Wis. 2d 147
    , ¶31
    (internal quotation mark omitted) (quoting State ex rel. Fiedler
    v.    Wis.    Senate,      
    155 Wis. 2d 94
    ,        100,    
    454 N.W.2d 770
          (1990))
    34
    No.    2015AP2019
    (emphasis in original); see also Town of Holland v. Vill. of
    Cedar Grove, 
    230 Wis. 177
    , 190, 
    282 N.W. 111
    (1938) ("This court
    has    repeatedly        held     that     the    judicial           power     vested       by     the
    constitution in the courts cannot be exercised by administrative
    or executive agencies.").
    ¶49     The propriety of our deference doctrine, therefore,
    depends      on    whether      it    transfers        to       a    coordinate          branch    of
    government        a     quantum      of    our    core          powers.        To        make     that
    determination,          we    need    to   describe         those         powers    well        enough
    that, if they are present in our deference doctrine, we will
    recognize them.
    ¶50     From     the     earliest     days          of       our    country,       we     have
    understood         that       the      judiciary's              first       and      irreducible
    responsibility is to proclaim the law:                              "It is emphatically the
    province and duty of the judicial department to say what the law
    is."    
    Marbury, 5 U.S. at 177
    .                   The process of interpreting the
    law in a specific case is part of that central duty:                                     "Those who
    apply the rule to particular cases, must of necessity expound
    and interpret that rule."                  
    Id. We agreed
    with Marbury just a
    few    years      ago   when    we    described        our       judicial      power       as     "the
    ultimate       adjudicative          authority        of   courts         to   finally          decide
    rights and responsibilities as between individuals."                                      State v.
    Williams, 
    2012 WI 59
    , ¶36, 
    341 Wis. 2d 191
    , 
    814 N.W.2d 460
    .
    ¶51     It is fair to say that exercising judgment in the
    interpretation and application of the law in a particular case
    is the very thing that distinguishes the judiciary from the
    other branches:
    35
    No.   2015AP2019
    The judiciary . . . has no influence over either the
    sword or the purse, no direction either of the
    strength or of the wealth of the society, and can take
    no active resolution whatever.    It may truly be said
    to have neither Force nor Will, but merely judgment;
    and must ultimately depend upon the aid of the
    executive arm even for the efficacy of its judgments.
    The Federalist No. 78, at 523 (Alexander Hamilton) (Jacob Cooke
    ed., 1961).        We, too, have said as much:                      "By vesting the
    judicial       power   in     a     unified      court    system,    the    Wisconsin
    Constitution       entrusts         the    judiciary       with      the    duty   of
    interpreting and applying laws made and enforced by coordinate
    branches of state government."                   Gabler, 
    376 Wis. 2d 147
    , ¶37;
    see also State v. Van Brocklin, 
    194 Wis. 441
    , 443, 
    217 N.W. 277
    (1927)    ("Judicial        power    is   that    power   which     adjudicates    and
    protects the rights and interests of individual citizens, and to
    that     end    construes     and     applies      the    laws."     (quoted   source
    omitted)).
    ¶52     Some would argue that the judiciary's law-declaring
    and law-applying power lies not at the core of what it means to
    be a court, but somewhere out on the periphery of our powers
    where we share it with the executive branch.                      Some of our older
    cases have spoken in terms that lend this proposition at least
    some superficial plausibility.                  For example, in State ex rel.
    Wisconsin Inspection Bureau v. Whitman we said:
    Every executive officer in the execution of the law
    must of necessity interpret it in order to find out
    what it is he is required to do.            While his
    interpretation is not final, yet in the vast majority
    of cases it is the only interpretation placed upon it,
    and as long as it is acquiesced in it becomes the
    official interpretation which the courts heed and in
    36
    No.   2015AP2019
    which they oftentimes                 acquiesce       as     a   practical
    construction.
    
    196 Wis. 472
    , 497, 
    220 N.W. 929
    (1928); see also Rules of Court
    
    Case, 204 Wis. at 504
    (same) (quoting this portion of Whitman).
    And even earlier, we had noted the quasi-judicial nature of some
    administrative bodies:
    We do not consider the Industrial Commission a court,
    nor do we construe the act as vesting in the
    Commission judicial powers within the meaning of the
    constitution. It is an administrative body or arm of
    the   government   which  in   the   course   of   its
    administration of a law is empowered to ascertain some
    questions of fact and apply the existing law thereto,
    and in so doing acts quasi-judicially, but it is not
    thereby   vested    with  judicial    power   in   the
    constitutional sense.
    Borgnis v.   Falk Co., 
    147 Wis. 327
    , 358, 
    133 N.W. 209
    (1911)
    (emphasis in original).
    ¶53   But      these     cases        cannot    bear       the   weight      their
    proponents assign them.           The executive must certainly interpret
    and apply the law; it would be impossible to perform his duties
    if he did not.       After all, he must determine for himself what
    the law requires (interpretation) so that he may carry it into
    effect (application).        Our constitution not only does not forbid
    this, it requires it.            Wis. Const. art. V, § 1 ("The executive
    power shall be vested in a governor, . . . ."); Perez v. Mortg.
    Bankers   Ass'n,    135     S.     Ct. 1199,       1217    (2015)    (Thomas,     J.,
    concurring) ("It is undoubtedly true that the other branches of
    Government have the authority and obligation to interpret the
    law, . . . .").            But     this     comprises          interpretation     and
    application within the executive branch.                   We are here concerned
    37
    No.        2015AP2019
    with the authoritative interpretation and application of the law
    as applied to a particular case                   within the judicial                branch.
    "[O]nly      the      judicial       interpretation              [as       opposed            to
    interpretations       offered      by      the    other      branches]          would         be
    considered authoritative in a judicial proceeding."                             
    Perez, 135 S. Ct. at 1217
    (Thomas, J., concurring).                      Even Rules of Court
    Case and Whitman recognize that the executive's understanding of
    the   law    is    provisional,      and      that     it    gains     a    measure          of
    permanence only through habit and inertia.                       See Rules of Court
    
    Case, 204 Wis. at 504
    ; 
    Whitman, 196 Wis. at 497
    ("While [the
    executive's]       interpretation        is     not    final,    yet       in     the     vast
    majority of cases it is the only interpretation placed upon
    it, . . . in       which    [the    courts]       oftentimes         acquiesce          as     a
    practical construction.").           We do not understand Borgnis to say
    anything different.         There, we recognized that the work of some
    administrative       agencies      looks      very     similar    to       that      of      the
    courts.      We     described      the   power        they   exercised          as   "quasi
    judicial,"    but    it    was   "quasi"        rather   than     simply        "judicial"
    because they had no power to impose their understanding of the
    law on the judiciary's resolution of a particular case.30
    30
    Justice Ann Walsh Bradley suggests we have committed
    "legal error" and ignored "controlling precedent."  Justice Ann
    Walsh Bradley's concurrence, ¶¶111, 115.    Presumably, she is
    referring to the observation in Borgnis that "a board may
    lawfully be endowed with very broad powers, and its conclusions
    may be given great dignity and force, so that courts may not
    reverse them unless the proof be clear and satisfactory that
    they are wrong."   See Borgnis v. Falk Co., 
    147 Wis. 327
    , 359,
    
    133 N.W. 209
    (1911).    As an initial matter, it is not clear
    whether Borgnis was here referring to findings of fact or
    (continued)
    38
    No.     2015AP2019
    ¶54    When    we     distill         our     cases    and    two     centuries         of
    constitutional        history           to   their     essence,      the     result       is    a
    lodestar      that    leads       us    directly      to   the    most     central       of    our
    powers:       "No aspect of the judicial power is more fundamental
    than    the     judiciary's            exclusive      responsibility          to     exercise
    judgment      in    cases    and       controversies         arising      under    the    law."
    Gabler, 
    376 Wis. 2d 147
    , ¶37; see also Operton, 
    375 Wis. 2d 1
    ,
    ¶73 (R. Grassl Bradley, J., concurring) (indicating that "the
    court's      duty    to     say    what      the     law    is"    constitutes       a    "core
    judicial function"); In re Appointment of Revisor, 
    141 Wis. 592
    ,
    598, 
    124 N.W. 670
    (1910) (stating that                            "it is the exclusive
    function of the courts to expound the laws").                                Judgment, of
    course, encompasses interpreting and applying the law to the
    case sub judice.            
    Marbury, 5 U.S. at 177
    ("Those who apply the
    rule    to    particular          cases,      must     of     necessity       expound          and
    interpret that rule."); The Federalist No. 78, at 525 (Alexander
    Hamilton) (Jacob Cooke ed., 1961) ("The interpretation of the
    laws   is     the    proper       and    peculiar      province      of    the     courts.");
    conclusions of law. If the former, this opinion does not tread
    on those grounds. If the latter, then Borgnis would be counted
    amongst those cases with which we treat today. If we choose to
    overrule it we risk aspersions on our wisdom, but not legal
    error.   Nor would we be ignoring controlling precedent.     The
    doctrine the case espouses is our own, and is, therefore,
    unquestionably within our remit to accept or reject without
    committing legal error. And because the case itself is our own,
    it is impossible for it to control our decision. Stare decisis
    is a critical rule that promotes stability by ensuring we do not
    abandon precedent for light or transient reasons. But it is not
    a limitation on our authority.
    39
    No.     2015AP2019
    
    Roggensack, supra
    ¶18, at 547 (stating that "[d]eclaring what a
    statute means is a core function of the courts").                         We conclude
    that only the judiciary may authoritatively interpret and apply
    the law in cases before our courts.                      The executive may not
    intrude on this duty, and the judiciary may not cede it.                        If our
    deference doctrine allows either, we must reject it.
    4.   "Great Weight" Deference Considered
    ¶55    We see our core judicial powers lying at the heart of
    "great weight" deference.         When the doctrine's preconditions are
    satisfied, that is, when an administrative agency meets the four
    Harnischfeger     criteria,     we    cede   to    the      agency    the     power    to
    authoritatively interpret the law ("an agency's interpretation
    must    then    merely    be   reasonable      for     it     to     be    sustained,"
    
    Harnischfeger, 196 Wis. 2d at 661
    ), and apply the law to the
    case before us ("the courts should not substitute their judgment
    for the agency's         application    of a particular statute to the
    found facts," 
    Pabst, 19 Wis. 2d at 323
    -24 (emphasis added)).
    Because      Harnischfeger     made   this    a    structural         piece     of    the
    standard by which we review an agency's decision, we arrive at
    the    legal    issues    involved     in    the     case    with     an    a    priori
    commitment to letting the agency decide them.                      But Marbury and
    Gabler say the power to interpret and apply the law in the case
    at bar is an exclusively judicial power.                      Therefore, because
    that power belongs to the judiciary——and the judiciary alone——we
    may not allow an administrative agency to exercise it.
    ¶56    We provide guardrails for an administrative agency's
    exercise of our power, to be sure, but they are minimal.                         Under
    40
    No.     2015AP2019
    great     weight    deference,    we    simply     require    that   the     agency's
    judgment on the law not overrule our precedents, violate the
    constitution,          contradict        legislative         history,        or      be
    unreasonable.31        Within those expansive boundaries, however, the
    agency is the master of statutory construction and application,
    and it occupies the field to the exclusion of the judiciary.32
    We reserve a sufficient quantum of judicial power to set the
    guardrails, but that gives no good answer to the charge that
    this doctrine cedes something that belongs exclusively to the
    judiciary.       We are concerned here with categories of power, not
    quantity.     Regardless of the circumscriptions we put in place,
    when we defer we are allowing the agency to exercise what is
    unmistakably core judicial power.
    ¶57     Chief     Justice        Roggensack     has     been       particularly
    incisive    in     describing    the    practical    problems       this    deference
    causes.       She    has   observed       that     "[w]hat    decision-avoidance
    doctrines accomplish is to relieve the court of the real work of
    judicial     review,    what    has    been   described      as   the      'burden   of
    31
    We will defer if "a rational basis exists in law for the
    agency's interpretation and it does not conflict with the
    statute's legislative history, prior decisions of this court, or
    constitutional prohibitions."    Bucyrus-Erie Co. v. DILHR, 
    90 Wis. 2d 408
    , 417, 
    280 N.W.2d 142
    (1979) (quoting Pabst v. Wis.
    Dep't of Taxation, 
    19 Wis. 2d 313
    , 324, 
    120 N.W.2d 77
    (1963)).
    32
    When great weight deference applies, a reviewing court
    must accept "an agency's reasonable statutory interpretation,
    even if the court concludes that another interpretation is
    equally reasonable, or even more reasonable, than that of the
    agency." Racine Harley-Davidson, Inc. v. Wis. Div. of Hearings
    & Appeals, 
    2006 WI 86
    , ¶17, 
    292 Wis. 2d 549
    , 
    717 N.W.2d 184
    .
    41
    No.    2015AP2019
    reasoned        decisionmaking.'"            
    Roggensack, supra
         ¶18,    at    546
    (quoted source omitted).              And it privileges unelected executive-
    branch employees over those the people of Wisconsin elected to
    resolve questions of law.
    When the court employs judicially created doctrines
    that limit the scope of its review instead of applying
    the collective knowledge that the seven justices were
    elected to exercise, it avoids the real work of
    appellate decision making:    explaining to the public
    why the application of the law to the facts of the
    case resulted in the court's decision and why that
    result is fair under the law.
    
    Roggensack, supra
    ¶18, at 560.
    ¶58        The abdication of core judicial power to the executive
    is a concern not just of our court, but of the federal judiciary
    as well.         Wisconsin's separation of powers is a reflection of
    that found in the United States Constitution, which provides (in
    relevant part) that "[t]he judicial Power of the United States,
    shall     be    vested    in   one    supreme      Court,    and   in     such   inferior
    Courts     as    the     Congress     may    from     time    to   time     ordain     and
    establish."        U.S. Const. art. III, § 1.33               Whereas our decision
    in      Harnischfeger          made     us        structurally      deferential         to
    administrative           agencies,     Chevron       U.S.A.,       Inc.     v.    Natural
    Resources       Defense     Council,        Inc.    accomplished        something      very
    similar for the federal courts.                    
    467 U.S. 837
    , 843 (1984).            In
    33
    "The executive Power shall be vested in a President of
    the United States of America." U.S. Const. art. II, § 1, cl. 1.
    "All legislative Powers herein granted shall be vested in a
    Congress of the United States, which shall consist of a Senate
    and House of Representatives." U.S. Const. art. I, § 1.
    42
    No.    2015AP2019
    reviewing         an     administrative                  agency's         interpretation            and
    application of a statute, the Supreme Court said:
    [T]he   court   does   not  simply   impose its   own
    construction on the statute, as would be necessary in
    the absence of an administrative interpretation.
    Rather, if the statute is silent or ambiguous with
    respect to the specific issue, the question for the
    court is whether the agency's answer is based on a
    permissible construction of the statute.
    
    Id. (footnote omitted).
                          The Court, it observed, "ha[s] long
    recognized that considerable weight should be accorded to an
    executive department's construction of a statutory scheme it is
    entrusted     to       administer,            and    the      principle      of       deference     to
    administrative interpretations has been consistently followed by
    this Court . . . ."                 
    Id. at 844
    (footnote omitted) (internal
    mark and quoted source omitted).
    ¶59    Jurists          in    federal         courts         have   expressed          the   same
    concern with Chevron deference as we have with Harnischfeger
    deference.         Justice          Clarence         Thomas        directly       questioned        the
    constitutionality             of    deferring         to      an    administrative           agency's
    interpretation           of        the    law        in       Michigan      v.        Environmental
    Protection     Agency,         
    135 S. Ct. 2699
    ,           2712      (2015)      (Thomas,      J.,
    concurring).           The EPA's request for deference, he said, "raises
    serious     questions         about       the       constitutionality            of    our    broader
    practice     of    deferring             to    agency         interpretations           of    federal
    statutes."        
    Id. He was
    concerned that this deference allowed
    the   judiciary         to    escape          its    responsibility          to       independently
    resolve questions of law:                     "[T]he judicial power, as originally
    understood,        requires          a    court          to    exercise       its       independent
    43
    No.   2015AP2019
    judgment in interpreting and expounding upon the laws."                            Id.
    (quoting    
    Perez, 135 S. Ct. at 1217
       (Thomas,    J.,    concurring))
    (alteration      in    original).     Yet,      "Chevron   deference        precludes
    judges from exercising that judgment, forcing them to abandon
    what they believe is 'the best reading of an ambiguous statute'
    in favor of an agency's construction."                
    Michigan, 135 S. Ct. at 2712
    (Thomas, J., concurring) (quoting Nat'l Cable & Telecomm.
    Ass'n v. Brand X Internet Servs., 
    545 U.S. 967
    , 983 (2005)).
    This "wrests from Courts the ultimate interpretative authority
    to 'say what the law is,' Marbury v. Madison, 1 Cranch 137, 177,
    
    2 L. Ed. 60
       (1803),      and   hands      it   over   to   the     Executive."
    
    Michigan, 135 S. Ct. at 2712
    (Thomas, J., concurring).                        Such a
    transfer of power, he concluded, "is in tension with Article
    III's Vesting Clause, which vests the judicial power exclusively
    in   Article     III    courts,     not   administrative        agencies."         
    Id. (citing U.S.
    Const. art. III, § 1).
    ¶60   Justice Antonin Scalia was equally concerned with the
    possible abandonment of judicial power to the executive branch.
    Although he supported Chevron's imprimatur on the executive's
    authority       to    adopt    policy-making        regulations       to    fill    up
    interstitial statutory silences, his approval did not extend to
    an agency's authority to make binding pronouncements on the law:
    I suppose it is harmless enough to speak about "giving
    deference to the views of the Executive" concerning
    the meaning of a statute, just as we speak of "giving
    deference to the views of the Congress" concerning the
    constitutionality   of   particular   legislation——the
    mealy-mouthed word "deference" not necessarily meaning
    anything more than considering those views with
    44
    No.   2015AP2019
    attentiveness and profound respect, before we reject
    them.    But to say that those views, if at least
    reasonable, will ever be binding——that is, seemingly,
    a striking abdication of judicial responsibility.
    The     Honorable           Antonin        Scalia,     Judicial         Deference      to
    Administrative Interpretations of Law, 1989 Duke L.J. 511, 513–
    14 (1989).        Chevron deference eventually spawned Auer deference,
    which      requires         federal        courts     to     prefer      an    agency's
    interpretation         of     its     regulations          over   the    court's     own
    interpretation.34           This, Justice Scalia believed, was a mistake
    because of its effect on a court's authority to decide questions
    of law:
    I would therefore restore the balance originally
    struck by the APA with respect to an agency's
    interpretation   of  its   own  regulations,   not  by
    rewriting the Act in order to make up for Auer, but by
    abandoning Auer and applying the Act as written. The
    agency is free to interpret its own regulations with
    or without notice and comment; but courts will decide—
    —with no deference to the agency——whether that
    interpretation is correct.
    
    Perez, 135 S. Ct. at 1213
    (Scalia, J., concurring).                               And he
    understood that Chevron was what made it possible:                        "The problem
    is bad enough, and perhaps insoluble if Chevron is not to be
    uprooted,       with   respect        to   interpretive        rules    setting     forth
    agency interpretation of statutes."                  
    Perez, 135 S. Ct. at 1212
    .
    ¶61       Justice Neil Gorsuch, when he was on the Tenth Circuit
    Court      of    Appeals,      elegantly          summarized      how   deference     to
    administrative agencies hollows out a court's judicial power:
    34
    See Auer v. Robbins, 
    519 U.S. 452
    (1997).
    45
    No.   2015AP2019
    Yet, rather than completing the task expressly
    assigned        to        us,        rather       than
    "interpret[ing] . . . statutory provisions," [5 U.S.C.
    § 706] declaring what the law is, and overturning
    inconsistent agency action, Chevron step two tells us
    we must allow an executive agency to resolve the
    meaning of any ambiguous statutory provision. In this
    way, Chevron seems no less than a judge-made doctrine
    for the abdication of the judicial duty.    Of course,
    some role remains for judges even under Chevron.    At
    Chevron step one, judges decide whether the statute is
    "ambiguous," and at step two they decide whether the
    agency's view is "reasonable."
    Gutierrez-Brizuela v. Lynch, 
    834 F.3d 1142
    , 1151–52 (10th Cir.
    2016) (Gorsuch, J., concurring) (brackets in original).    What he
    said of Chevron is equally true of Harnischfeger:   "But where in
    all this does a court interpret the law and say what it is?
    When does a court independently decide what the statute means
    and whether it has or has not vested a legal right in a person?
    Where Chevron   applies that job seems to have gone extinct."
    
    Gutierrez-Brizuela, 834 F.3d at 1152
    (Gorsuch, J., concurring).35
    35
    Justice Ann Walsh Bradley does not believe our deference
    doctrine cedes our core judicial power to administrative
    agencies: "[C]ontrary to the majority/lead opinion's assertion,
    agency deference does not remove from the court its interpretive
    role and cede it to the agency."    Justice Ann Walsh Bradley's
    concurrence, ¶119.     She says we still must engage in the
    exercise of statutory construction so that we may compare our
    interpretation to the agency's because "[o]nly reasonable
    interpretations are worthy of deference."    See 
    id. Yes, but
    that says nothing about whose "reasonable interpretation"
    controls the case. If we interpret a statute for ourselves, but
    then set it aside in favor of the agency's interpretation, we
    have ceded our authority.       The point of the interpretive
    exercise is not to see if we are as good at it as an
    administrative agency; it is to apply the results of our efforts
    to the case before us.    If we fail to do that, then we have
    failed to act as a court.
    46
    No.    2015AP2019
    ¶62       Indeed, it has.                   And that presents a related, and
    equally serious problem.
    *
    ¶63       Ceding judicial power to an administrative agency is,
    from        a        separation          of     powers       perspective,           unacceptably
    problematic; it is problematic along a different axis when that
    agency appears in our courts as a party.                               The non-agency party
    may reasonably ask whether our deference doctrine will deprive
    him    of       an    impartial          decisionmaker's       exercise        of   independent
    judgment, and, thereby, the due process of law.36
    ¶64       The    United       States        Supreme    Court     says    that    a   "fair
    trial in a fair tribunal is a basic requirement of due process."
    In re Murchison, 
    349 U.S. 133
    , 136 (1955).                                  We have remarked
    that this proposition is so plain as to be axiomatic.                                  State v.
    Herrmann, 
    2015 WI 84
    , ¶25, 
    364 Wis. 2d 336
    , 
    867 N.W.2d 772
    .                                   But
    there       cannot       be     a    fair       trial       without     a   constitutionally
    acceptable decisionmaker:                     "It is, of course, undisputable that
    a   minimal          rudiment       of    due      process    is   a   fair     and    impartial
    decisionmaker."               Guthrie         v.    WERC,    
    111 Wis. 2d 447
    ,        454,   
    331 N.W.2d 331
    (1983).                  Our commitment to this principle is such
    that we do not accept even the appearance of bias:                                       "[W]hen
    36
    "Procedural due process under the Fourteenth Amendment to
    the United States Constitution and Article I, Section 1 of the
    Wisconsin Constitution protect against government actions that
    deprive an individual of life, liberty, or property without due
    process of the law." Adams v. Northland Equip. Co., 
    2014 WI 79
    ,
    ¶64, 
    356 Wis. 2d 529
    , 
    850 N.W.2d 272
    .
    47
    No.    2015AP2019
    determining        whether     a   defendant's           right     to    an    objectively
    impartial        decisionmaker     has      been        violated    we       consider       the
    appearance       of    bias   in   addition        to    actual     bias.           When   the
    appearance of bias reveals a great risk of actual bias, the
    presumption       of   impartiality        is    rebutted,       and     a    due    process
    violation occurs."            Herrmann, 
    364 Wis. 2d 336
    , ¶46.                      Therefore,
    a    biased      decisionmaker        is    "constitutionally             unacceptable."
    Withrow v. Larkin, 
    421 U.S. 35
    , 47 (1975).37
    ¶65     We have already concluded that our deference doctrine
    cedes to administrative agencies some of our exclusive judicial
    powers.       It necessarily follows that when that agency comes to
    us as a party in a case, it——not the court——controls some part
    of   the    litigation.        When    questions         of   law   arise,         the    court
    serves      as    a    gatekeeper      to       adjudge       compliance           with     the
    Harnischfeger prerequisites.               But once the court completes that
    task, it receives instruction from the governmental party on how
    to interpret and apply the rule of decision.
    ¶66     When a court defers to the governmental party, simply
    because it is the government, the opposing party is unlikely to
    37
    Our Code of Judicial Conduct reflects the foundational
    importance of keeping core judicial power in the hands of an
    independent judiciary:     "Our legal system is based on the
    principle that an independent, fair and competent judiciary will
    interpret and apply the laws that govern us."        SCR ch. 60,
    Preamble.   The comment to the first rule (SCR 60.02) says that
    our   institutional   legitimacy  depends  on   this   principle.
    "Deference to the judgments and rulings of courts depends upon
    public confidence in the integrity and independence of the
    judges." SCR 60.02 cmt.
    48
    No.    2015AP2019
    be   mollified        with    assurances           that    the      court      bears     him    no
    personal animus as it does so.38                      The injury arises not from the
    reason the court favors one party over another, but from the
    fact    that    the     court    has   a     favorite          at   all.39      As     Professor
    Phillip        Hamburger        observed,          "when       judges         defer     to      the
    executive's view of the law, they display systematic bias toward
    one of the parties."                Philip Hamburger, Chevron Bias, 84 Geo.
    Wash. L. Rev. 1187, 1212 (2016).                        Harnischfeger deference, like
    Chevron      deference,       "is     an    institutionally              declared      and     thus
    systematic       precommitment         in       favor     of     the     government."           Cf.
    
    Hamburger, supra
    ¶66, at 1211.
    ¶67     This   systematic           favor      deprives      the      non-governmental
    party of an independent and impartial tribunal.                                 Justice David
    Prosser sounded the alarm on this issue in Hilton ex rel. Pages
    Homeowners'       Association          v.        DNR,     
    2006 WI 84
    ,      ¶¶54-55,        
    293 Wis. 2d 1
    , 
    717 N.W.2d 166
    (Prosser, J., concurring).                                  When great
    weight      deference     applies,         he     said,    "[t]he        supreme      court    and
    other       Wisconsin        courts        are     expected         to       rationalize       and
    rubberstamp       the    agency's      decision           unless       the    agency's       legal
    38
    "The danger to independent judgment arises whenever
    judges relinquish their judgment in any degree, and the danger
    of systematic bias arises whenever judges show greater respect
    for the legal position of one party than that of the other."
    Philip Hamburger, Chevron Bias, 84 Geo. Wash. L. Rev. 1187, 1202
    (2016).
    39
    "Of course, the bias arises from institutional precedent
    rather than individual prejudice, but this makes the bias
    especially systematic and the Fifth Amendment due process
    problem especially serious." 
    Id. at 1189.
    49
    No.    2015AP2019
    interpretation       is    plainly          wrong.        The      result    is    that   many
    litigants have lost their right to a decision by an independent
    judiciary."         Id.;        see     also    Gabler,         
    376 Wis. 2d 147
    ,       ¶39
    (indicating       that    "[i]f       the    judiciary         passively      permits     [the
    executive]       branch        to   arrogate        judicial        power    unto     itself,
    however       estimable    the        professed      purpose        for     asserting     this
    prerogative,       the    people       inevitably         suffer"      because     they   lose
    "their independent arbiters of the law"); 
    Roggensack, supra
    ¶18,
    at    546     ("Indeed,    some       writers       who     have    examined       judicially
    created decision-avoidance doctrines have stated that when 'the
    scope    of    review     is    too    limited,       the      right   to    review     itself
    becomes meaningless.'" (quoted source omitted)).
    ¶68     The situation appears no better when considered from
    the     agency's    perspective.               When       an    administrative        agency
    interprets and applies the law in a case to which it is a party,
    it is to that extent acting as judge of its own cause.                                By the
    time the Framers condemned such an arrangement, the rationale
    had already been a part of our wisdom literature for centuries:
    No man is allowed to be a judge in his own cause;
    because   his  interest   would  certainly  bias   his
    judgment, and, not improbably, corrupt his integrity.
    With equal, nay with greater reason, a body of men,
    are unfit to be both judges and parties, at the same
    time; . . . .
    50
    No.     2015AP2019
    The Federalist No. 10, at 59 (James Madison) (Jacob Cooke ed.,
    1961).40     Echoing Madison, the United States Supreme Court said
    that "no man can be a judge in his own case[,] and no man is
    permitted to try cases where he has an interest in the outcome."
    In re 
    Murchison, 349 U.S. at 136
    .
    ¶69    An administrative agency has an obvious interest in
    the   outcome      of   a   case      to   which    it     is    a   party.      Yet,     our
    deference doctrine commits the rule of decision to its hands
    anyway.      It is entirely unrealistic to expect the agency to
    function     as     a    "fair      and        impartial        decisionmaker"       as   it
    authoritatively tells the court how to interpret and apply the
    law   that   will       decide     its     case.        Because      it   cannot    do    so,
    deference threatens the most elemental aspect of a fair trial.41
    
    Guthrie, 111 Wis. 2d at 454
       ("[A]    minimal      rudiment      of    due
    process is a fair and impartial decisionmaker.").                             This is not
    to question the agency's good faith, which we presume.                                It is
    40
    Sir Edward Coke said "it is a maxime in law, aliquis non
    debet esse judex in propria causa."   1 Edward Coke, Institutes
    of the Laws of England § 212 (James & Luke G. Hansard & Sons
    19th ed. 1832) (1628).   He said so in English, too:   "[I]t is
    against reason, that if wrong be done any man, that he thereof
    should be his own judge."   Id.; see also Dr. Bonham's Case, 77
    Eng. Rep. 646, 652, 8 Co. Rep. 113 (1610) (in which Sir Coke
    applied this maxim).
    41
    This is not to say an administrative agency cannot
    satisfy    the  due   process   requirement  of   an   impartial
    decisionmaker as it decides contested cases within the executive
    branch.   And nothing in our opinion today should be understood
    to question that.
    51
    No.    2015AP2019
    merely to join with the ancients in recognizing that no one can
    be impartial in his own cause.
    *
    ¶70     As a postscript to this issue, it is worth recalling
    that great weight deference is a creature of our own making——
    that is, nothing in our statutes called it into being.                            If
    anything, the relevant provision under which we normally review
    agency    decisions      militates      against       it.   Subsection    227.57(5)
    says:
    The court shall set aside or modify the agency action
    if   it  finds   that   the  agency   has  erroneously
    interpreted   a  provision  of   law   and  a  correct
    interpretation compels a particular action, or it
    shall remand the case to the agency for further action
    under a correct interpretation of the provision of
    law.
    Wis. Stat. § 227.57(5).              This says nothing about comparing our
    interpretation of the law to that of the agency, or gatekeeping,
    or reasonableness.            Instead, the statute says the court is to
    decide    whether       the    agency       has      "erroneously   interpreted    a
    provision of law."             
    Id. And the
    court is to determine the
    "correct interpretation of the provision of law."                         
    Id. This formulation
    recognizes the proper residence of our core judicial
    powers.
    5.   "Due Weight" Deference Considered
    ¶71     "Due        weight,"       as        a    principle,    entered       our
    jurisprudence through a statute, but over time our cases grafted
    it into the administrative deference doctrine.                       The original
    statutory foundation, however, is still there, and is just as
    52
    No.   2015AP2019
    viable as it was before.           Today, we restore the principle of
    "due weight" to its original form by removing the patina of
    "deference" with which our cases have covered it.
    ¶72     It is true that due weight deference presents a threat
    to our core powers that is less extensive than that presented by
    great       weight   deference.    It    has   been   said   that     "in   most
    situations, applying due weight deference will lead to the same
    result as would applying no deference at all."                MercyCare Ins.
    Co. v. Wis. Comm'r of Ins., 
    2010 WI 87
    , ¶37, 
    328 Wis. 2d 110
    ,
    
    786 N.W.2d 785
    ; see also Operton, 
    375 Wis. 2d 1
    , ¶22 ("We note
    here    that     there   is    little   difference    between     due    weight
    deference and no deference, since both situations require us to
    construe       the   statute    ourselves."    (internal     quotation      mark
    omitted) (quoting Cty. of Dane v. LIRC, 
    2009 WI 9
    , ¶19, 
    315 Wis. 2d 293
    , 
    759 N.W.2d 571
    )).
    ¶73     The threat presented by due weight deference is less,
    however, only in the sense that the preconditions that justify
    the agency's exercise of our exclusive power are fulfilled more
    rarely.       When the "due weight" preconditions are satisfied,42 we
    must defer to the agency when our respective views of the law,
    42
    The preconditions are that: (1) "the statute is one that
    the agency was charged with administering"; and (2) "the agency
    has at least some expertise in the interpretation of the statute
    in question."     Operton, 
    375 Wis. 2d 1
    , ¶20 (quoting Racine
    Harley-Davidson, Inc., 
    292 Wis. 2d 549
    , ¶107 (Roggensack, J.,
    concurring) (internal quotation mark omitted)).
    53
    No.     2015AP2019
    while       different,      are   equally          reasonable.43          When    there       is
    equipoise,      the    court      cedes    its       core   judicial      power        just   as
    surely as if great weight deference had applied.                                 Infrequency
    does not make the cession appropriate.
    ¶74    Nor does cession become acceptable because the agency
    has    less    latitude      in   exercising         our    power    under       due    weight
    deference than it does under great weight deference.                              In Racine
    Harley-Davidson, Inc., 
    292 Wis. 2d 549
    ,                       ¶¶14-15,       we suggested
    that    granting      deference      did       not    abandon      our    judicial       power
    because we retained the authority to establish the guardrails
    within       which    the     agency      exercised         that    power.         See        
    id. (emphasizing that
    the court decides "whether deference is due,"
    "what level of deference is due," and "the reasonableness of the
    agency interpretation").             But providing the agency with even the
    most exacting tutelage on how to exercise our power does not
    change the fact that it is exercising our power.                          It is the fact
    of    cession,       not    its   frequency         or   latitude,       that    implicates
    separation of powers and due process concerns.                           The power within
    the guardrails is part of our core, and so we may not parcel it
    out    in    even    the    smallest      of    doses.        Therefore,         due    weight
    deference and great weight deference are structurally unsound
    for the same reasons.
    *
    43
    See UFE 
    Inc., 201 Wis. 2d at 287
    n.3 (stating that under
    due weight deference, "an equally reasonable interpretation of a
    statute should not be chosen over the agency's interpretation").
    54
    No.   2015AP2019
    ¶75   On   the    other   hand,   "due   weight"——in   its   statutory
    form——presents no such concerns.           There are five provisions in
    Wis. Stat. § 227.57 that address how we handle questions of law
    in reviewing an agency's decision:
    (3) The court shall separately treat disputed issues
    of   agency   procedure,    interpretations of  law,
    determinations of fact or policy within the agency's
    exercise of delegated discretion.
    . . . .
    (5) The court shall set aside or modify the agency
    action if it finds that the agency has erroneously
    interpreted   a  provision  of   law  and   a  correct
    interpretation compels a particular action, or it
    shall remand the case to the agency for further action
    under a correct interpretation of the provision of
    law.
    . . . .
    (8) The court shall reverse or remand the case to the
    agency if it finds that the agency's exercise of
    discretion is . . . in violation of a constitutional
    or statutory provision; . . . .
    . . . .
    (10) Subject     to sub. (11), upon such review due weight
    shall    be       accorded    the   experience,   technical
    competence,      and specialized knowledge of the agency
    involved, as      well as discretionary authority conferred
    upon it.
    (11) Upon review of an agency action or decision
    affecting a property owner's use of the property
    owner's property, the court shall accord no deference
    to the agency's interpretation of law if the agency
    action or decision restricts the property owner's free
    use of the property owner's property.
    Wis. Stat. § 227.57(3), (5), (8), (10)-(11).
    55
    No.    2015AP2019
    ¶76   None of these provisions direct us to defer to an
    agency's     interpretation         or    application        of    the    law.        To    the
    contrary, subsection (3) tells us to treat questions of law
    separately from all other matters in the case (reminiscent of
    the    analytical        approach       mentioned     in     Pabst);      subsection (5)
    recognizes the court, not the agency, as the law-declaring body;
    and subsection (8) calls for us to test an agency's exercise of
    discretion        against       relevant        constitutional           and     statutory
    provisions (without any suggestion that the agency is to decide
    what those provisions mean).
    ¶77   We      find       the        legislature's             commendation           of
    administrative agencies in subsection (10).                          There, we learn we
    are to give "due weight" (subject to subsection (11)——more about
    that     later)     to    the   "experience,          technical        competence,          and
    specialized       knowledge        of    the    agency       involved."          From      our
    earliest     days    we     have    recognized        that     the     state's    agencies
    develop      a    valuable      perspective,          unique      to     them,    as       they
    administer the laws within their portfolios.                         See 
    Harrington, 28 Wis. at 69
    (finding it significant that "the office of attorney
    general ha[d] been filled by nine different individuals, all of
    them     gentlemen        of    learning        and    accomplishment            in     their
    profession"); see also Motor Transp. Co. v. Pub. Serv. Comm'n,
    
    263 Wis. 31
    , 43, 
    56 N.W.2d 548
    (1953) (recognizing that "the
    Public    Service        Commission      possesses     wide       experience     and       much
    technical knowledge in the field of regulation of motor-carrier
    transportation of property").                  It was, in fact, our appreciation
    for that collected wisdom that originally led to our deference
    56
    No.    2015AP2019
    doctrine.       See 
    Roggensack, supra
    ¶18, at 557 (referring to the
    "oft-cited          foundation     for        deferring        to     agency        decisions,
    administrative expertise").
    ¶78    Recognizing that administrative agencies can sometimes
    bring     unique      insights     to     the        matters     for     which      they     are
    responsible, however, does not mean we should defer to them.
    And there is nothing in Wis. Stat. § 227.57(10) that suggests we
    should.        We    believe     the    Department        accurately          described      the
    meaning and effect of this provision.                            It acknowledged that
    giving      "due      weight"    to      an     agency's         experience,        technical
    competence, and specialized knowledge will not "oust the court
    as    the   ultimate        authority         or     final     arbiter"       of    the    law.
    Instead,       it     said,     "due     weight"        means       giving     "respectful,
    appropriate consideration to the agency's views" while the court
    exercises its independent judgment in deciding questions of law.
    We    agree.         "Due     weight"     is        a   matter      of   persuasion,         not
    deference.
    ¶79    But "due weight" is not a talisman that automatically
    grants its bearer additional rhetorical power.                                If an agency
    brings to court nothing but a rote recitation of its background
    with the subject matter, it should not expect the statutory
    directive to give its argument extra heft.                          The agency should be
    prepared to explain how its experience, technical competence,
    and     specialized         knowledge         give      its    view      of    the     law     a
    significance or perspective unique amongst the parties, and why
    that background should make the agency's view of the law more
    persuasive than others.            As we assess the persuasiveness of the
    57
    No.      2015AP2019
    agency's perspective, we will consider the same types of factors
    that    formerly         informed        our     deference           doctrine,          to    wit:
    (1) whether        the   legislature           made    the     agency     responsible          for
    administering the statute in question; (2) the length of time
    the administrative agency's interpretation has stood; (3) the
    extent to which the agency used its expertise or specialized
    knowledge     in     developing          its    position;          and    (4) whether          the
    agency's perspective would enhance uniformity and consistency of
    the law.
    ¶80   Before concluding our "due weight" analysis, we must
    still account for the effect of Wis. Stat. § 227.57(11).                                      This
    provision     says       that       "[u]pon    review        of   an     agency       action    or
    decision     affecting          a    property        owner's      use    of     the      property
    owner's property, the court shall accord no deference to the
    agency's interpretation of law if the agency action or decision
    restricts the property owner's free use of the property owner's
    property."       § 227.57(11).           The plain meaning of this subsection
    is   that    the    court       should       forswear       deference      to      an    agency's
    interpretation of the law in the identified circumstances.                                     The
    legislature added this subsection in 2015, and simultaneously
    made   subsection (10)              subject     to    its    provisions.              2015    Wis.
    Act 391, §§ 30, 31.                 By doing so, the legislature necessarily
    implied that it understood subsection (10) as allowing the court
    to defer to an agency's interpretation of law.                             Even though the
    text of that subsection says nothing about deference, there was
    good    reason      to     understand           it    that        way.        By        the   time
    subsection (11)          entered       the     statutes,       our      treatment        of   both
    58
    No.   2015AP2019
    "great weight" and "due weight" had long since matured into our
    current deference doctrine.              Adding subsection (11), therefore,
    exempted       the   identified       circumstances      not     from    a    statutory
    command,       but    from     the     decision-avoidance         effects      of    our
    deference doctrine.          Consequently, we understand subsection (11)
    as   a    partial     dismantling       of    our   deference     doctrine.          Our
    decision today completes the process.
    ¶81   By returning "due weight" to its statutory roots, and
    ending our erstwhile deference, we honor the requirements of
    Wis.     Stat.   § 227.57(10),         the   separation     of    powers,      and   the
    parties'       due   process      interests.        We   agree    with    now-Justice
    Gorsuch's observations about the benefits of rejecting decision-
    avoidance doctrines like ours:
    [D]e novo judicial review of the law's meaning would
    limit the ability of any agency to alter and amend
    existing law.    It would avoid the due process and
    equal protection problems of the kind documented in
    our decisions. It would promote reliance interests by
    allowing citizens to organize their affairs with some
    assurance that the rug will not be pulled from under
    them tomorrow, the next day, or after the next
    election.
    
    Gutierrez-Brizuela, 834 F.3d at 1158
    (Gorsuch, J., concurring).
    6.      Standard of Review
    59
    No.     2015AP2019
    ¶82     We are mindful that our decision today represents a
    significant break with the way we have reviewed agency decisions
    since at least Harnischfeger, and in some respects, since Pabst.
    The principle of stare decisis counsels that we depart from our
    precedents only when circumstances unavoidably superannuate our
    commitment to them.       Typically, that occurs when:
    (1) [c]hanges   or  developments  in  the   law  have
    undermined the rationale behind a decision; (2) there
    is a need to make a decision correspond to newly
    ascertained facts; (3) there is a showing that the
    precedent has become detrimental to coherence and
    consistency in the law; (4) the prior decision is
    "unsound in principle;" or (5) the prior decision is
    "unworkable in practice."
    Bartholomew v. Wis. Patients Comp. Fund, 
    2006 WI 91
    , ¶33, 
    293 Wis. 2d 38
    , 
    717 N.W.2d 216
    (quoted source omitted).
    ¶83     We are leaving our deference doctrine behind because
    it is unsound in principle.           It does not respect the separation
    of powers, gives insufficient consideration to the parties' due
    process interest in a neutral and independent judiciary, and
    "risks     perpetuating     erroneous        declarations     of         the   law."
    Operton, 
    375 Wis. 2d 1
    , ¶73 (R. Grassl Bradley, J., concurring).
    Although    persistency    of   our   precedents     normally      protects      the
    rule of law, sometimes "[w]e do more damage to the rule of law
    by obstinately refusing to admit errors, thereby perpetuating
    injustice,    than   by   overturning       an   erroneous   decision."          See
    Johnson Controls, Inc. v. Emp'rs Ins. of Wausau, 
    2003 WI 108
    ,
    ¶¶97, 100, 
    264 Wis. 2d 60
    , 
    665 N.W.2d 257
    .
    60
    No.    2015AP2019
    ¶84     Today, the core judicial power ceded by our deference
    doctrine       returns       to     its    constitutionally-assigned                 residence.
    Henceforth,           we     will         review        an       administrative        agency's
    conclusions of law under the same standard we apply to a circuit
    court's      conclusions          of     law——de      novo.        See    Mitchell     Bank      v.
    Schanke, 
    2004 WI 13
    , ¶24, 
    268 Wis. 2d 571
    , 
    676 N.W.2d 849
    ("We
    review legal conclusions of the circuit court de novo.").                                       As
    with judicial opinions, we will benefit from the administrative
    agency's analysis, particularly when they are supplemented by
    the "due weight" considerations discussed above.                               Cf. Megal Dev.
    Corp.     v.     Shadof,          
    2005 WI 151
    ,         ¶8,     
    286 Wis. 2d 105
    ,          
    705 N.W.2d 645
    ("While the review is de novo, this court benefits
    from    the     analyses          of   the     circuit       court       and   the   court      of
    appeals.").            And,       as     always,      we     review      the   administrative
    agency's decision, not that of the circuit court.                                      Ho-Chunk
    Nation v. DOR, 
    2009 WI 48
    , ¶12, 
    317 Wis. 2d 553
    , 
    766 N.W.2d 738
    ("In a case that involves a ruling by the Commission, we review
    the    Commission's          decision          rather      than     the    decision        of   the
    circuit court.").                The facts in this case are undisputed, so we
    address only questions of law.                          See Vogel v. Grant-Lafayette
    Elec.     Co-op.,          
    201 Wis. 2d 416
    ,          422,      
    548 N.W.2d 829
           (1996)
    ("Whether       the    facts        of    a    particular         case     fulfill     a    legal
    standard is a question of law we review de novo.").
    7.     Discontinuing Deference for Administrative Reasons
    ¶85     We created our deference doctrine ex nihilo, and so it
    is within our power to end it simply by declaring it at an end.
    Some    members       of     the       court    prefer       that       option——discard         the
    61
    No.     2015AP2019
    doctrine      not     because    the    constitutional         problems    require       its
    abandonment,        but   merely       because    we    have    chosen    to     drop    it.
    However, just because we can do this does not make it wise.
    Indeed, stare decisis exists as a principle for the sole purpose
    of counseling against that option.
    ¶86    Justice Gableman provided a thoughtful account of why
    he    would     end    the      deference    doctrine      on     non-constitutional
    grounds.        Ultimately, however, his rationale still depends on
    the     separation        of    powers——sotto          voce,    to   be         sure,    but
    undeniably.         Thus, for example, he says our deference doctrine
    is    unsound    in    principle       because    "deference      (especially           great
    weight deference), if correctly and honestly applied, leads to
    the     perverse       outcome     of     courts       often    affirming         inferior
    interpretations of statutes."                Justice Gableman's concurrence,
    ¶166.     That is indubitably true.                   But it is true only if one
    already subscribes to the proposition that our interpretation
    enjoys pride of place over that of the administrative agency.
    We    should     not      be    surprised        to    learn,    however,         that    an
    administrative agency might believe its own interpretation is
    superior to ours.              Indeed, we should expect no less from an
    agency engaged in a good faith effort to do its job.                              From the
    agency's perspective, therefore, our deference doctrine creates
    no perversity at all; instead, it gives the statute the best
    possible interpretation:                Its own.        So when Justice Gableman
    says that "[i]n our role as court of last resort, we should
    62
    No.     2015AP2019
    ensure      that        erroneous-but-reasonable          legal    conclusions          are
    corrected,"44 he is making a separation of powers assertion——to
    wit, the court is the authoritative arbiter of the law in the
    case before us, and our opinion must prevail over that of the
    other branches.            Without that constitutional impetus, there is
    no fuel for his "unsound in principle" analysis.
    ¶87    Justice        Gableman     also     says   newly-ascertained             facts
    provide     a      non-constitutional          basis     for    ending     deference.45
    Specifically, he notes that part of the justification for the
    doctrine was the assumed subject-matter expertise of the agency
    decision-makers.           He questions whether they really do have such
    expertise, and then concludes:                   "We may say that it is only a
    matter of speculation that agency decision-makers possess less
    expertise        than    courts   when    it     comes   to    interpreting       various
    statutes.         Importantly, it is equally a matter of speculation
    that they possess more."46               So as Justice Gableman acknowledges,
    these      are     not     newly-ascertained           facts,     they     are     newly-
    ascertained speculations.                Our deference doctrine has defined
    the     relationship         between      administrative        agencies         and    the
    judiciary for over two decades now.                 Speculation about a hearing
    44
    Justice Gableman's concurrence, ¶166.
    45
    
    Id., ¶167. 46
               
    Id. 63 No.
       2015AP2019
    examiner's        expertise      seems        an         especially           diaphanous
    justification for upending this settled history.47
    ¶88      The members of the court who would end our deference
    doctrine for administrative reasons do so out of a desire to
    avoid     a   constitutional    analysis.          But    as   Justice        Gableman's
    concurrence      demonstrates,     it    is    impossible          to     describe     a
    substantive reason for ending the doctrine without at least an
    unspoken appeal to constitutional principles.                      We do no good
    service by avoiding an analysis that so obviously demands our
    attention.
    *
    ¶89      Justice Ziegler would also prefer dispensing with our
    deference      doctrine   for   administrative           reasons   because       she   is
    concerned about how our decision will affect the finality of
    past cases.       The source of her concern is not entirely clear——
    this decision is incapable of reopening cases that have already
    been decided.48      If they were final upon release of this opinion,
    their finality will go on undisturbed by our decision today.
    Relief from the judgment of a case is governed by Wis. Stat.
    47
    Justice Gableman also says our deference doctrine has not
    delivered on promised gains in judicial efficiency. 
    Id., ¶165. But
    the court has not been made aware of any study performing a
    differential analysis of litigative effort before and after
    Harnischfeger. So this, too, is a matter of speculation.
    48
    Justice Ann Walsh Bradley shares Justice Ziegler's
    concern about the effect of our decision on the finality of
    previously decided cases.   See Justice Ann Walsh Bradley's
    concurrence, ¶131.
    64
    No.     2015AP2019
    § 806.07.      Justice Ziegler thinks our rationale would allow a
    party to successfully reopen a case for several of the reasons
    mentioned in that statute, including "[m]istake" (para. (a)), or
    because "[t]he judgment is void" (para. (d)), or because "[a]
    prior      judgment       upon    which   the      judgment     is    based        has   been
    reversed" (para. (f)), or for "[a]ny other reasons justifying
    relief from the operation of the judgment" (para. (h)).                              Justice
    Ziegler's concurrence, ¶139 n.3.                     She cites no authority for
    this proposition, nor could she.
    ¶90     Justice Ziegler's concern cannot be realized here for
    the same reason it has never been realized when we overrule one
    of   our    prior        decisions.       That       has    never     occurred       because
    overruling a case does not expose to collateral attack any of
    the intervening decisions that were based on the overruled case.
    "To the contrary," Justice Ziegler says, "overruling one of our
    prior decisions[] can quite obviously have significant impact on
    other cases."         
    Id. But for
    over twenty years the impossibility
    of   her     concern       has    been    black-letter         law:         "The     statute
    [§ 806.07] does not authorize relief from a judgment on the
    ground      that    the     law    applied      by    the    court     in     making     its
    adjudication       has     been    subsequently       overruled       in     an    unrelated
    proceeding."          Schauer v. DeNeveu Homeowner's Ass'n, Inc., 
    194 Wis. 2d 62
    ,        75,    
    533 N.W.2d 470
          (1995).49         True,    as     Justice
    Ziegler       observed,           Schauer         specifically         addressed          the
    49
    By "black-letter law," we mean that Schauer appears in
    the annotations for Wis. Stat. § 806.07.
    65
    No.    2015AP2019
    circumstance         in   which        "[a]        prior       judgment    upon        which    the
    judgment      is     based      has         been        reversed."         See     Wis.        Stat.
    § 806.07(1)(f); Justice Ziegler's concurrence, ¶139 n.3.                                         But
    that's why the case is so instructive.                               The whole point of
    Schauer's analysis was that when a court enters judgment in
    reliance on specific case precedent, the judgment's finality is
    entirely unaffected if the precedent is subsequently reversed.
    That's exactly the concern that Justice Ziegler expressed, and
    Schauer says "don't worry."
    ¶91       The other provisions of Wis. Stat. § 806.07 provide no
    cause for worry either.                If a reversed precedent cannot stand in
    for a prior reversed judgment, there is no logical process——no
    matter how much it might resemble a Rube Goldberg machine——by
    which    it     could         stand         in     for     a     "void     judgment"           under
    paragraph (d).                And     the        catch-all        "[a]ny     other        reasons
    justifying relief" is not worry-inducing because "[t]he general
    rule is that 'a change in the judicial view of an established
    rule of law is not an extraordinary circumstance which justifies
    relief        from        a         final        judgment         under      [Wis.             Stat.
    § 806.07(1)(h)].'"             Allstate Ins. Co. v. Brunswick Corp., 
    2007 WI App 221
    , ¶7, 
    305 Wis. 2d 400
    , 
    740 N.W.2d 888
    (alteration in
    original)      (quoted         source        omitted)          (capitalization          omitted);
    accord Schwochert v. Am. Family Mut. Ins. Co., 
    166 Wis. 2d 97
    ,
    103, 
    479 N.W.2d 190
    (Ct. App. 1991), aff'd, 
    172 Wis. 2d 628
    , 
    494 N.W.2d 201
    (1993) (same).                   Finally, the "[m]istake" provision of
    § 806.07(1)(a) can raise no alarm because it is never a mistake
    (within the meaning of this statute) for a court to rely on our
    66
    No.     2015AP2019
    precedent.     Subsequently overruling the precedent cannot, to a
    metaphysical certainty, make an intervening court's reliance on
    the precedent a "mistake"——unless, that is, we are to presume
    the intervening court's ability to look forward in time to espy
    our change before we make it.
    ¶92    Justice Ziegler's concern is unknown to the law.          And
    she has identified no mechanism by which this unrealizable fear
    could possibly come to pass.
    ¶93    Justice Ann Walsh Bradley and Justice Ziegler are also
    concerned about whether our decision will adversely affect the
    precedential authority of cases decided pursuant to our now-
    discarded deference doctrine.     To the extent a court favored an
    agency's conclusion of law over its own, that conclusion is now
    part of the judgment of the case and an inextricable part of the
    opinion.     Consequently, its precedential and controlling effect
    will be the same as if the court had based the decision on its
    own interpretation.     The only future effect of our decision is
    that courts, rather than administrative agencies, will decide
    questions of law.     If that prospect is sufficient to raise an
    alarm   against    impending   "tumult"   (see   Justice     Ann   Walsh
    Bradley's concurrence, ¶120), then we have more to worry about
    than a deference doctrine.
    67
    No.   2015AP2019
    B.   "Processing" River Sediments
    ¶94   Now that we have identified the proper standard of
    review, we can address the petitioners' argument that they are
    not subject to the tax imposed by Wis. Stat. § 77.52(2).                  This
    statute provides that:
    For the privilege of selling, performing or furnishing
    the services described under par. (a) at retail in
    this state to consumers or users, a tax is imposed
    upon all persons selling, performing or furnishing the
    services at the rate of 5% of the gross receipts from
    the sale, performance or furnishing of the services.
    § 77.52(2).    The services to which this provision refers include
    the following:
    The producing, fabricating, processing, printing or
    imprinting of tangible personal property for a
    consideration for consumers who furnish directly or
    indirectly the materials used in the producing,
    fabricating, processing, printing or imprinting. This
    subdivision does not apply to the printing or
    imprinting of tangible personal property that results
    in printed material, catalogs, or envelopes that are
    exempt under s. 77.54(25) or (25m).
    § 77.52(2)(a)11.
    ¶95   The parties agree that, in this case, the petitioners
    are   liable   for    the   tax   imposed   by   the   Department    only   if
    Stuyvesant     Dredging     received    compensation     for    "processing"
    tangible personal property it received (directly or indirectly)
    from the petitioners.         The parties also agree that the river
    sediment comprised tangible personal property, that Stuyvesant
    Dredging received compensation for the work it performed on the
    river sediment, and that the river sediment was furnished by the
    68
    No.      2015AP2019
    petitioners.50           Therefore,        the           only    question         is    whether
    Stuyvesant Dredging's work constituted "processing."
    ¶96   Because this case turns on the meaning of the term
    "processing" in Wis. Stat. § 77.52(2)(a)11., our task involves
    discerning       the    meaning      of   statutory             text.        We   discover     a
    statute's     meaning          in   its    text,           context,      and        structure.
    "[S]tatutory      interpretation          begins          with    the   language        of    the
    statute," and we give that language its "common, ordinary, and
    accepted meaning."             State ex rel. Kalal v. Circuit Court for
    Dane Cty., 
    2004 WI 58
    , ¶¶45-46, 
    271 Wis. 2d 633
    , 
    681 N.W.2d 110
    (internal mark and quoted source omitted) ("Context is important
    to meaning.       So, too, is the structure of the statute in which
    the operative language appears.                      Therefore, statutory language
    is   interpreted        in    the   context         in   which     it   is    used;     not    in
    isolation but as part of a whole; in relation to the language of
    surrounding        or        closely-related             statutes; . . . .").                  In
    performing       this    analysis,        we        carefully      avoid      ascribing        an
    unreasonable meaning to the text.                         See 
    id., ¶46 ("[S]tatutory
    language    is    interpreted . . . reasonably,                    to   avoid       absurd     or
    unreasonable results.").              If we determine the statute's plain
    meaning through this methodology, we go no further.                                 
    Id., ¶¶45- 46
    ("If the meaning of the statute is plain, we ordinarily stop
    the inquiry." (internal mark and quoted source omitted)).                                     See
    50
    Tetra Tech engaged J.F. Brennan Co., Inc. to dredge the
    contaminated sediments and deliver them to Stuyvesant Dredging
    for separation.
    69
    No.     2015AP2019
    generally Daniel R. Suhr, Interpreting Wisconsin Statutes, 100
    Marq. L. Rev. 969 (2017).
    ¶97    Our    statutes      do    not   define     the    term   "processing."
    Consequently, the Commission turned to a dictionary to assist
    its    analysis,          stating      "[t]he     dictionary        definition         of
    'processing'       is     'to   put    through    the    steps    of   a     prescribed
    procedure; or, to prepare, treat, or convert by subjecting to a
    special     process.'"          The    petitioners      reject    this     definition,
    arguing that it is so broad it transforms a narrow and selective
    tax   statute      into    a    general    tax   on     all    services      related   to
    tangible personal property.               They would instead have us find the
    term's meaning in the Administrative Code.                       Specifically, they
    propose     Wis.    Admin.      Code    § Tax    11.38(2)      (June   1993),     which
    provides:
    Fabricating and processing services, where materials
    are furnished directly or indirectly by the customer,
    that are subject to Wisconsin sales or use tax
    include, except as provided in sub. (1)(a) through
    (c):
    (a) Application of coating to pipe.
    (b) Assembling kits to produce a completed product.
    (c) Bending glass tubing into neon signs.
    (d) Bookbinding.
    (e) Caterer's preparation of food for consumption on
    or off the caterer's premises.
    (f) Cleaning used oil.
    (g) Cutting lumber to specifications and producing
    cabinets, counter tops or other items from lumber for
    customers, often called "millending."
    70
    No.     2015AP2019
    (h) Cutting or crushing               stones,          gravel    or     other
    construction materials.
    (i) Drying, planing or ripping lumber.
    (j) Dyeing or fireproofing fabric.
    (k) Fabricating steel which may involve cutting the
    steel to length and size, bending and drilling holes
    in the steel to specifications of a particular
    construction job.
    (L) Firing of ceramics or china.
    (m) Heat treating or plating.
    (n) Laminating identification cards.
    (o) Making a fur coat from pelts, gloves or a jacket
    from a hide.
    (p) Making curtains, drapes,                   slip    covers    or     other
    household furnishings.
    (q) Production of a sound recording or motion picture.
    (r) Retreading tires.
    (s) Tailoring a suit.
    (t) Threading pipe or welding pipe.
    Wis. Admin. Code § Tax 11.38(2)(a)-(t).
    ¶98     Although       we   conclude           that     Stuyvesant        Dredging
    "processed" the river sediment into its constituent parts, we do
    not believe either party provided a satisfactory definition of
    the   term.      The     petitioners      rely   on     Wis.     Admin.       Code    § Tax
    11.38(2) as an exhaustive recitation of "processing" services
    subject     to   Wisconsin's      sales        and     use    tax.          Because    the
    separation of river sediment does not appear in this list, they
    conclude      that     the    principle     expressio          unius    est     exclusio
    alterius      excludes       Stuyvesant     Dredging's          services       from    the
    71
    No.     2015AP2019
    statute's reach.          This canon of statutory construction would be
    helpful if the list of services were meant to be exhaustive,
    rather than illustrative.                But this is a tool of elucidation
    only——it has no power to contradict the code's text.                         And by its
    own terms, § Tax 11.38(2) contains an illustrative list, not a
    comprehensive one.              The operative language says:               "Fabricating
    and    processing        services, . . . that        are    subject     to    Wisconsin
    sales or use tax include, . . . ."                   
    Id. (emphasis added)
    .            The
    term "include" tells us that what follows is not exhaustive.
    See State v. James P., 
    2005 WI 80
    , ¶26, 
    281 Wis. 2d 685
    , 
    698 N.W.2d 95
    ("[G]enerally, the word 'includes' is to be given an
    expansive meaning, indicating that which follows is but a part
    of the whole." (quoting Wis. Citizens Concerned for Cranes &
    Doves    v.    DNR,      
    2004 WI 40
    ,    ¶17   n.11,      
    270 Wis. 2d 318
    ,      
    677 N.W.2d 612
    )).         Further, even if it wished to, it is doubtful
    that    the    Department        could    restrict    the    scope    of     Wis.   Stat.
    § 77.52(2)      through     the    promulgation       of    § Tax    11.38(2).        The
    petitioners identify no authority giving the Department power to
    either broaden or constrict the types of services subject to
    sales and use taxes.             So it does not appear there is any way in
    which we could read § Tax 11.38(2) as a complete definition of
    "processing."
    ¶99     As   an    illustrative       list,    Wis.     Admin.      Code      § Tax
    11.38(2) is similarly unhelpful to the petitioners' cause.                            The
    petitioners say they purchased services that involved nothing
    more    than    "separating"        tangible     personal      property       into    its
    components.         But this could be said of cleaning used oil, too,
    72
    No.    2015AP2019
    which presumably involves separating contaminants from the oil.
    See § Tax 11.38(2)(f).                The petitioners also say that Stuyvesant
    Dredging's work cannot be understood as "processing" because it
    neither added nor subtracted anything from the personal property
    on which it performed its services.                             This could be said with
    equal accuracy of those who crush stones, and yet that service
    is    part    of     the    Department's          illustrative          list.         See    § Tax
    11.38(2)(h).               So     § Tax     11.38(2)            does     not    advance        the
    petitioners' argument because it is not an exclusive list of
    "processing" activities, and because, as an illustrative list,
    it describes activity analogous to Stuyvesant Dredging's work.
    ¶100 But the petitioners have a legitimate concern about
    the   breadth        of    the    Commission's            definition      of    "processing."
    That term stands cheek by jowl with "producing," "fabricating,"
    "printing," and "imprinting" in Wis. Stat. § 77.52(2)(a)11.                                     If
    "processing" really comprehends everything that puts tangible
    physical property "through the steps of a prescribed procedure,"
    or applies a "special process" to "prepare, treat, or convert"
    it,   then     the     term      swallows    all      of    its    sentence-mates.             For
    example, "producing" means "to make or manufacture (a product or
    commodity) from components or raw materials."                                  Producing, The
    Oxford       English       Dictionary       (2d      ed.    1989)       (definition         3.e.).
    Manufacturing something would certainly involve putting tangible
    property       through          the     steps        of     a     prescribed          procedure.
    Similarly, "fabricating" means "[t]o make anything that requires
    skill;    to    construct,            manufacture."             Fabricating,      The       Oxford
    English        Dictionary             (2d   ed.           1989)        (definition          1.a.).
    73
    No.     2015AP2019
    Fabricating, like producing, puts property through a prescribed
    procedure.      And "printing" means "[t]o make or produce (text, a
    book, a picture, etc.) by a mechanical process involving the
    transfer of characters or designs on to paper, vellum, etc."
    Printing,       The   Oxford       English           Dictionary        (2d         ed.    1989)
    (definition     II.8.a.).         And     finally,         "imprinting"       means       "[t]o
    mark by pressure; to impress, stamp," "[t]o impress (letters or
    characters) on paper or the like by means of type," and "[t]o
    make an impression or impressed figure upon; to stamp or impress
    (something) with a figure, etc."                    Imprinting, The Oxford English
    Dictionary      (2d   ed.    1989)       (definitions          1.a.,    2.,        and    4.a.,
    respectively).        Each of these companion terms could fairly be
    understood as specific examples of the Commission's definition
    of "processing."           But ascribing such a broad meaning to that
    word would make surplusage of all the companion terms.                               Whenever
    possible, we avoid reading statutory language in a fashion that
    leaves some of it with no work to do.                        Kalal, 
    271 Wis. 2d 633
    ,
    ¶46    ("Statutory     language          is     read    where       possible         to    give
    reasonable        effect     to        every       word,      in    order          to     avoid
    surplusage.").
    ¶101 Therefore, we must understand "processing" to bear a
    meaning that does not displace all of the other descriptors in
    Wis.    Stat.     § 77.52(2)(a)11.             We    begin     with    the     purpose       of
    subdivision 11.,       which      is    to     identify      categories       of     services
    performed    on    tangible       personal         property    that    are         subject   to
    Wisconsin's sales and use tax.                  As we pursue the proper meaning
    of     "processing,"        its    companion           terms       provide         invaluable
    74
    No.       2015AP2019
    assistance.        The      noscitur          a        sociis       canon    of        construction
    (literally, "it is known from its associates") instructs that
    "[w]hen two or more words or phrases are listed together, the
    general    terms . . . may             be    defined          by     the     other          words    and
    understood in the same general sense."                               Schill v. Wis. Rapids
    Sch. Dist., 
    2010 WI 86
    , ¶66, 
    327 Wis. 2d 572
    , 
    786 N.W.2d 177
    ;
    accord State v. Quintana, 
    2008 WI 33
    , ¶35, 
    308 Wis. 2d 615
    , 
    748 N.W.2d 447
    ("[A]n unclear statutory term should be understood in
    the same sense as the words immediately surrounding or coupled
    with it." (quoted source omitted)).                             Because the structure of
    the text indicates that the terms are of equal dignity, we will
    not read any one of them to swallow the others.                                        Although the
    types     of   services      may       share           some     (and    even       many)          common
    characteristics, each will retain an independent meaning so long
    as it has at least one attribute distinct from the others.                                          With
    these     principles      in      mind,       we        can     discern       a        meaning      for
    "processing"     that       is    informed             by,    and    consistent             with,    its
    associates.
    ¶102 Based         on        the        definitions             above,        we        see     that
    "fabricating"     is      distinct           from       its     associates             in    that    it
    requires skill in the construction or manufacture of a final
    product.       "Producing"         contemplates               the    creation          of     a   final
    product from the combination of components or raw materials, a
    characteristic      that          is        not         necessarily          encompassed              by
    "fabricating," which could describe the manufacture of a product
    out of a single resource.                    "Printing" differs from the other
    categories in that it involves "the transfer of characters or
    75
    No.   2015AP2019
    designs" onto a medium.          And finally, "imprinting" is unique
    even from "printing" in that characters or designs are impressed
    on a medium through pressure (as, for example, metal stamping in
    which     the   medium   is   deformed    to   depict   the   character    or
    design).51
    51
    Justice Ziegler's concurrence, to the extent it addresses
    whether "processing" encompasses the activity at issue here, is
    based in large part on a mistaken impression that the
    legislature defined "printing" and "imprinting."     It did not.
    She refers to Wis. Stat. § 77.51(11), which says (in full):
    "'Printing'     and     'imprinting'     include     lithography,
    photolithography, rotogravure, gravure, letterpress, silk screen
    printing,     multilithing,     multigraphing,     mimeographing,
    photostating, steel die engraving and similar processes." This
    is not a definition. It is an incomplete list of examples. It
    is not a definition for the same reason we do not consider Wis.
    Admin. Code § Tax 11.38(2) a definition of "processing," which
    similarly contains an incomplete list of examples.
    Nonetheless, Justice Ziegler finds significance in the
    title of section 77.51, "Definitions."  But this means, quite
    literally, nothing:    "The titles to subchapters, sections,
    subsections, paragraphs and subdivisions of the statutes and
    history notes are not part of the statutes."       Wis. Stat.
    § 990.001(6).
    And the fact that the legislature did not feel the need to
    say which category encompasses which activities does not mean
    printing and imprinting are the same thing (as Justice Ziegler
    suggests). See Justice Ziegler's, concurrence, ¶143. It means
    the legislature did not care to separate them into their proper
    categories, a fact from which no useful information can be
    drawn.   It is theoretically possible to use this illustrative
    list to develop a definition of "printing" or "imprinting." But
    that would involve first defining each of the listed activities,
    and   then  extrapolating   the  constituent   elements  into  a
    definition for the two terms. Even at that, the result would be
    uncertain because there is no way to identify the category to
    which each listed activity belongs.    Consequently, recourse to
    Wis. Stat. § 77.51(11) simply isn't helpful in discovering a
    definition for "printing" or "imprinting."
    76
    No.    2015AP2019
    ¶103 Turning now to the proper meaning of "processing," we
    know it must contain at least one attribute that is distinct
    from    those       described        above     if   it   is   not      to     displace       its
    neighbors.          The       Oxford     English     Dictionary        says    "processing"
    means, in pertinent part, "[t]o subject to or treat by a special
    process; to operate on mechanically or chemically."                             Processing,
    The Oxford English Dictionary (2d ed. 1989) (definition 3.a.).
    It is poor form to use the defined word in its own definition,
    mostly       because          such   a    construct       provides          little     to     no
    information.         Here, this infraction means the first clause tells
    us nothing but that processing is "special," which is entirely
    unhelpful.              The     second     clause,       however,       is     instructive.
    Applying that material to the term "processing" as it appears in
    Wis.        Stat.       § 77.52(2)(a)11.            yields    a        meaning       with      a
    characteristic distinct from its companions.                            We conclude that
    "processing"        encompasses          the   performance        of    a    mechanical       or
    chemical operation on tangible personal property, a task that
    can be completed without transforming the property into a new
    product, or adding anything to it that was not already there.52
    "Fabricating" and "producing" both necessarily contemplate the
    creation      of    a    new     product,      which     makes    them       distinct       from
    52
    Our opinion should not be interpreted as an attempt to
    comprehensively define "processing," "fabricating," "producing,"
    "printing," or "imprinting."   With respect to "processing," we
    conclude the term is at least as broad as we have described.
    Whether it is more extensive than this is a question we need not
    answer to resolve this case.
    77
    No.   2015AP2019
    "processing."       And both "printing" and "imprinting" require the
    addition of something to the property that was not there before,
    which is not a requirement of "processing."                   Therefore, because
    we are able to identify a characteristic of "processing" that is
    distinct     from   its   companions,    we     have    confirmed     that   it   is
    capable of carrying a meaning that cannot subsume or be subsumed
    by the others.53
    ¶104 Understood in this fashion, "processing" encompasses
    Stuyvesant     Dredging's    separation       of     river    sediment    into    its
    component parts.          The Commission's Ruling and Order described
    how   this    was   accomplished.            After    going    through    scalping
    screens, slurry holding tanks, and slurry thickener tanks, the
    53
    Justice Ziegler would adopt a definition of "processing"
    without reference to the other terms in the statute, and
    apparently without much concern for whether this creates
    surplusage or results in an extraordinarily broad definition.
    See Justice Ziegler's concurrence, ¶¶146-53.          This loose
    approach to statutory construction might be acceptable in other
    contexts, but it is entirely inappropriate when addressing a tax
    statute, especially this one.     Section 77.52 of our statutes
    covers the sale of both goods and services.       See Wis. Stat.
    § 77.52(1) (goods), (2) (services). With respect to the former,
    the statute is all-encompassing; in contrast, this statute taxes
    services only if they are listed.       Compare § 77.52(1), with
    § 77.52(2)(a) ("The tax imposed herein applies to the following
    types of services: . . . ."). We must make our best effort at
    determining the specific meaning of the listed types of service
    because, as we have said before, "a tax cannot be imposed
    without clear and express language for that purpose, . . . ."
    DOR v. Milwaukee Ref. Corp., 
    80 Wis. 2d 44
    , 48, 
    257 N.W.2d 855
    (1977).   Justice Ziegler dispenses with those restrictions and
    safeguards by accepting any definition that might encompass
    Tetra Tech's activities.    Perhaps the legislature will one day
    adopt that approach, but this is not that day.
    78
    No.    2015AP2019
    sediment enters the coarse and fine sand separation operations.
    The coarse separation operation physically separates, washes,
    and dewaters sand particles larger than 150 microns from the
    sludge.     The fine sand separation operation does the same for
    sand particles between 63 and 150 microns.                             The petitioners
    confirm that everything Stuyvesant Dredging receives from them
    is    returned.         The   only    difference         is   that    the    property     is
    separated into its components.                  No new product has been created;
    no chemical transformation has occurred; and the property is
    still just as contaminated as when Stuyvesant Dredging received
    it.       The    work     described        by     the    Commission         reflects     the
    performance of a mechanical operation on the river sediments.
    Therefore, petitioners are subject to the sales and use tax of
    Wis.    Stat.     § 77.52(2)         because       Stuyvesant        Dredging      received
    compensation for "processing" river sediment received from the
    petitioners.
    ¶105 It    is     unlikely     that      our     definition     of    "processing"
    will    upset     the     petitioners'          reasonable      expectations.            The
    Commission      said     that    Tetra     Tech's       vice-president        of    project
    engineering testified that Stuyvesant Dredging "processed" the
    river sediment.           Similarly, an operations manager who oversaw
    LFR    Remediation's          work    on     the      Fox     River    testified        that
    Stuyvesant Dredging "processed" the river sediment.                                And the
    Commission observed that, "[a]t various points in the affidavits
    and    depositions       of   Petitioner's         general     manager      and    experts,
    they refer to what SDI [Stuyvesant Dredging] does as a 'process'
    or as 'processing.'             That language is also used in many of the
    79
    No.        2015AP2019
    contracts   between        Tetra      Tech    and    SDI."          Although        we    do    not
    derive the meaning of a statutory term from a party's subjective
    understanding, we recount this history as confirmation that our
    analysis    has    not     ventured      outside         the    realm        of    what        those
    subject to the statute might reasonably anticipate.
    ¶106 As       is    apparent       from       this     analysis,     we       gave     little
    weight     to     the      Commission's            understanding             of     the        term
    "processing."            We   recognize            the     legislature            charged       the
    Commission with the duty to decide contested cases involving the
    application of Wis. Stat. § 77.52(2).                           However, there is no
    indication the Commission has a long-standing interpretation of
    what "processing" means for purposes of § 77.52(2)(a)11.                                        Nor
    does the record intimate that it used any particular experience,
    technical   competence,          or    specialized          knowledge        to     develop      an
    understanding      of    that    term——it          relied      on   a   dictionary.               It
    necessarily follows that the Commission did not bring a unique
    perspective     or      significance         to    the     meaning      of    "processing."
    Consequently,        the      "due      weight"          calculus       of        Wis.         Stat.
    § 227.57(10)      did      not     increase          the     persuasiveness               of    the
    Commission's conclusion of law.
    80
    No.     2015AP2019
    III.   Conclusion
    ¶107 The petitioners paid Stuyvesant Dredging to                           process
    river      sediment        within        the    meaning         of     Wis.       Stat.
    § 77.52(2)(a)11., so they are liable for the sales and use tax
    imposed    by    § 77.52(2).         Therefore,     we    affirm     the      court     of
    appeals.
    ¶108 We have also decided to end our practice of deferring
    to   administrative        agencies'      conclusions      of     law.         However,
    pursuant to Wis. Stat. § 227.57(10), we will give "due weight"
    to   the    experience,        technical       competence,       and      specialized
    knowledge       of    an   administrative      agency     as    we     consider        its
    arguments.
    By    the       Court.—The   decision     of   the   court      of      appeals    is
    affirmed.
    81
    No.   2015AP2019.awb
    ¶109 ANN WALSH BRADLEY, J.             (concurring).     I concur in the
    mandate of the court because I agree that the term "processing"
    as       used   in    Wis.    Stat.    § 77.52(2)(a)11.          encompasses       the
    separation of river sediment into its component parts.                             See
    majority/lead op., ¶3.1             Such a result is compelled whether we
    1
    I refer to Justice Kelly's opinion as a "majority/lead"
    opinion to assist litigants and courts in understanding its
    precedential value.     Justice Kelly's opinion is a majority
    opinion with regard to the statutory analysis of the term
    "processing" presented in Section II.B of the majority/lead
    opinion and the conclusions presented in Section III. See State
    v. Elam, 
    195 Wis. 2d 683
    , 685, 
    538 N.W.2d 249
    (1995) (explaining
    that "a majority of the participating judges must have agreed on
    a particular point for it to be considered the opinion of the
    court.").   As set forth in footnote 4 of the majority/lead
    opinion, it also constitutes a majority in:
       Section     I,   setting   forth       the   facts   (which   are   not   in
    issue),
       Section II.A.1., providing a review of the current standard
    for review of agency decisions (which is not subject to
    reasonable dispute), and
       Section II.A.2., going through the history of the deference
    doctrine (which is, again, not in issue).
    In contrast, "a lead opinion is one that states (and agrees
    with) the mandate of a majority of the justices, but represents
    the reasoning of less than a majority of the participating
    justices." State v. Lynch, 
    2016 WI 66
    , ¶143, 
    371 Wis. 2d 1
    , 
    885 N.W.2d 89
    (Abrahamson & Ann Walsh Bradley, J.J., concurring in
    part, dissenting in part) (citing Hoffer Props., LLC v. State,
    Dep't of Transp., 
    2016 WI 5
    , 
    366 Wis. 2d 372
    , 
    874 N.W.2d 553
    );
    In re Disciplinary Proceedings Against Riley, 
    2016 WI 70
    , ¶¶92-
    95,   
    371 Wis. 2d 311
    ,  
    882 N.W.2d 820
      (Abrahamson,   J.,
    concurring).
    (continued)
    1
    No.    2015AP2019.awb
    give the agency's interpretation great weight, due weight, or no
    weight at all.
    ¶110 Further,         I    agree    with   the    concurrences        of    Justices
    Ziegler    and       Gableman      that,    consistent        with    our   doctrine    of
    constitutional avoidance, the court need not reach the issue of
    whether        our     deference          framework     violates       the        Wisconsin
    Constitution.
    ¶111 I write separately, however, for two reasons.                           First,
    the majority/lead opinion ignores controlling precedent to reach
    a      result        that     upends        decades      of     administrative          law
    jurisprudence.            Similarly, the concurrences of Justices Ziegler
    and Gableman, while not reaching the constitutional issue, would
    toss away a framework that has served courts well for decades.
    Second, the court's misguided wholesale changes create possible
    unintended consequences and a great deal of uncertainty.
    ¶112 The court should not so cavalierly discard our past
    practice.       Additionally, its apparent lack of concern for what
    will    become       of     the    jurisprudence        that    has    arisen      through
    deference gives rise to more questions than it answers.                                Are
    cases     in     which       courts       afforded      deference      to     an    agency
    interpretation still good law?                 Or do some of these issues need
    to be relitigated under the new standard of review the court
    A majority of justices do not embrace the reasoning or
    constitutional analysis set forth in Sections II.A.3 through
    II.A.6 of the majority/lead opinion. See majority/lead op., ¶3
    n.4.    The reasoning the majority/lead opinion presents for
    dispatching with our deference doctrine represents the reasoning
    of Justices Rebecca Grassl Bradley and Daniel Kelly only.
    2
    No.   2015AP2019.awb
    announces today?             The majority/lead opinion's assurances are of
    little comfort.         See Justice Ziegler's concurrence, ¶139 n.3.
    ¶113 Because I would not jettison a past practice that has
    served us well, I respectfully concur.
    I
    ¶114 At      the       outset,       I    observe         that    the       impetus    for
    dismantling years of administrative law jurisprudence did not
    come from any party, but from this court.                            The issue of whether
    our      agency        deference          doctrine         violates         the      Wisconsin
    Constitution was not raised by any party to this case before the
    circuit court, court of appeals, or in the petition for review
    here.     It was this court, sua sponte, that asked that the issue
    be addressed in the first instance.
    ¶115 Having        raised      the       issue,     the     majority/lead         opinion
    fails to follow established precedent when addressing it.                                    Had
    the majority/lead opinion adhered to our precedent, it would not
    have arrived at a result that creates such uncertainty.                                 To the
    contrary,     it       would       have    reached        the     conclusion         that    our
    deference doctrine comports with the Wisconsin Constitution.                                  By
    concluding that our deference doctrine removes the interpretive
    role of the judiciary, the majority/lead opinion commits legal
    error.
    ¶116 Indeed, this court previously examined a very similar
    question.         In   Borgnis       v.    Falk     Co.,    
    147 Wis. 327
    ,   358,    
    133 N.W. 209
       (1911),          the    court      addressed        an     argument      that    the
    workers' compensation law "is unconstitutional because it vests
    judicial    power       in    a    body    which     is    not    a    court      and   is   not
    3
    No.    2015AP2019.awb
    composed of men elected by the people, in violation of those
    clauses of the state Constitution which vest the judicial power
    in certain courts and provide for the election of judges by the
    people . . . ."
    ¶117 Rejecting the argument, the Borgnis court stated that
    the   commission    is   "an     administrative         body   or    arm    of    the
    government which in the course of its administration of a law is
    empowered to ascertain some questions of fact and apply the
    existing law thereto, and in so doing acts quasi-judicially, but
    it    is   not   thereby       vested    with       judicial    power       in   the
    constitutional sense."         
    Id. (second emphasis
    added).               The court
    added:
    While acting within the scope of its duty, or its
    jurisdiction, as it is sometimes called, such a board
    may lawfully be endowed with very broad powers, and
    its conclusions may be given great dignity and force,
    so that courts may not reverse them unless the proof
    be clear and satisfactory that they are wrong.
    
    Id. at 359.
    ¶118 Borgnis is on point here.            In response to the argument
    made over a century ago, the Borgnis court suggested that only
    clear violations of law, i.e. unreasonable interpretations, are
    outside    the   jurisdiction     of    an    agency.      This      is    the   same
    foundation underlying our deference framework.                 Although Borgnis
    addressed certiorari review, the same principle would apply to
    review of any administrative decision.
    ¶119 Further,      contrary       to    the    majority/lead         opinion's
    assertion, agency deference does not remove from the court its
    interpretive     role    and    cede     it    to    the   agency.          In   its
    4
    No.    2015AP2019.awb
    application,      deference         does        not    mean     accepting      an     agency's
    interpretation without a critical eye.                          Racine Harley-Davidson,
    Inc. v. State, Div. of Hearings and Appeals, 
    2006 WI 86
    , ¶15,
    
    292 Wis. 2d 549
    , 
    717 N.W.2d 184
    .                        Rather, "[t]he court itself
    must     always        interpret          the         statute      to     determine        the
    reasonableness         of    the    agency           interpretation."           
    Id. Only reasonable
    interpretations are worthy of deference.                            
    Id. ¶120 Not
    only does the majority/lead opinion throw tumult
    into a previously well-settled area of the law, but it does so
    based on a legal error.                   I would not upset the finality and
    consistency of our past decisions.
    II
    ¶121 I     write      next        to     call    attention        to    the    unknown
    consequences      of     the     court's         decision.         The    court's       result
    represents a tectonic shift in the administrative law landscape.
    See    Operton    v.     LIRC,      
    2017 WI 46
    ,   ¶71,   
    375 Wis. 2d 1
    ,       
    894 N.W.2d 426
         (Ziegler,        J.,     concurring)         ("There     is    little    doubt
    that   ending     the       court's      practice       of    according        deference   to
    agency interpretations of statutes would constitute a sea change
    in Wisconsin law[.]").              But on the topic of what this vast and
    sweeping change means for our prior cases, the majority/lead
    opinion provides precious little guidance.
    ¶122 Compounding            its        error,    the     majority/lead          opinion
    unwinds our three-tiered system of deference by declaring it
    unconstitutional where, as Justices Ziegler and Gableman aptly
    observe,   the     use      of   the     court's        administrative         powers    would
    suffice.        In doing so, the majority/lead opinion ignores our
    5
    No.    2015AP2019.awb
    usual practice of constitutional avoidance.                   See State v. Hale,
    
    2005 WI 7
    , ¶42, 
    277 Wis. 2d 593
    , 
    691 N.W.2d 637
    ("Normally this
    court will not address a constitutional issue if the case can be
    disposed   of   on    other    grounds.").         Again,      the     majority/lead
    opinion is silent as to the ramifications of constitutionalizing
    the question.     However, even making a decision on administrative
    grounds, we must consider the ramifications of such a decision.
    ¶123 The principle of stare decisis militates against the
    court's conclusion.           Stare decisis is based in part on "the
    desirability that the law furnish a clear guide for conduct of
    individuals, to enable them to plan their affairs with assurance
    against    untoward     surprise[.]"            Johnson       Controls,     Inc.    v.
    Employers Ins. of Wausau, 
    2003 WI 108
    , ¶95, 
    264 Wis. 2d 60
    , 
    665 N.W.2d 257
    (quoting Moragne v. States Marine Lines, Inc., 
    398 U.S. 375
    , 403 (1970)).           Parties appearing before agencies and
    those   appealing     agency    decisions    now    enter      uncharted     waters.
    With no guide, they could be subject to conflicting statutory
    interpretations      that   will   make    it    nearly       impossible    to     plan
    their affairs with any certainty.
    ¶124 This court, the court of appeals, and circuit courts
    throughout the state have applied great weight deference and due
    weight deference going back decades.               What is the precedential
    value of these cases now?          Are the principles they divine still
    good law even though they were reached through the application
    of a deference doctrine the court eschews today?
    ¶125 As     an    example,     let's    examine       a    case    involving     a
    question of statutory interpretation similar to that at issue
    6
    No.   2015AP2019.awb
    here.     In Zip Sort, Inc. v. Wis. DOR, 
    2001 WI App 185
    , ¶1, 
    247 Wis. 2d 295
    , 
    634 N.W.2d 99
    , the court of appeals addressed an
    agency interpretation of the term "manufacturing property" as
    used in Wis. Stat. § 70.995.2
    2
    Wis. Stat. § 70.995 (1993-94) provides in relevant part:
    (1) APPLICABILITY. (a)    In     this    section
    "manufacturing property"   includes all lands,
    buildings, structures and other real property
    used in manufacturing, assembling, processing,
    fabricating, making or milling tangible personal
    property for profit . . .
    . . .
    (d) Except for the activities under sub.
    (2),    activities     not classified    as
    manufacturing in the standard industrial
    classification     manual, 1987    edition,
    published by the U.S. office of management
    and budget are not manufacturing for this
    section.
    (2) FURTHER CLASSIFICATION. In addition to the
    criteria set forth in sub. (1), property shall be
    deemed prima facie manufacturing property and
    eligible for assessment under this section if it
    is included in one of the following major group
    classifications   set  forth   in  the   standard
    industrial classification manual, 1987 edition,
    published by the U.S. office of management and
    budget. . . . :
    . . .
    j)   27—Printing,       publishing   and    allied
    industries.
    . . .
    (v) 39—Miscellaneous manufacturing industries.
    7
    No.    2015AP2019.awb
    ¶126 The    question          presented       was     whether       Zip     Sort's
    activities entitled it to a "manufacturing property" designation
    for tax purposes.         Zip Sort's primary business was to make mail
    machine-sortable through the addition of a bar code.                        
    Id., ¶3. ¶127
    The    Department          of     Revenue      determined       that     such
    activity    did     not        entitle       Zip    Sort     to    a      manufacturing
    classification for its property, and the Tax Appeals Commission
    agreed.     
    Id., ¶10. In
    examining this determination, the court
    of appeals initially set about to determine the proper level of
    deference to accord to the Department's interpretation of the
    term    "manufacturing         property."          
    Id., ¶¶11-22. The
        court
    declined to "determine whether the proper standard of review is
    due    weight   deference       or   great       weight    deference      because    [it]
    conclude[d] that the commission's conclusions under § 70.995 at
    least met the due weight deference standard."                     
    Id., ¶22. ¶128
    Pursuant      to    such     a   standard,      the   court     of    appeals
    determined that the commission's interpretation was reasonable,
    and that Zip Sort's interpretation was "no more reasonable."
    
    Id., ¶34. Accordingly,
    it affirmed the commission's decision.
    
    Id. Whether the
    commission's interpretation was correct did not
    enter the analysis.
    ¶129 If it applied a de novo standard of review, would the
    Zip Sort court reach the same result?                     I do not know.         However,
    the Zip Sort decision was reached through the methodology that a
    majority of this court now disowns (and that several members
    suggest is contrary to the Wisconsin Constitution).                        Is what was
    a settled point of law since 2001 now unsettled?                       Can businesses
    8
    No.   2015AP2019.awb
    and agencies rely on our past decisions in planning their future
    activities?        The majority/lead opinion's assurances that they
    can   provide     little    comfort       and   are    thinly    supported.           See
    Justice Ziegler's concurrence, ¶139 n.3.
    ¶130 Zip Sort is not the only case where an appellate court
    has applied our three-tiered deference methodology.                          It serves
    as    but   one   example   of   the      myriad      cases    where       courts    have
    faithfully applied the deference jurisprudence as set forth by
    this court.
    ¶131 The court has significantly upset the finality of our
    past cases.       "[F]requent and careless departure from prior case
    precedent     undermines     confidence         in   the   reliability         of   court
    decisions."       Johnson Controls, 
    264 Wis. 2d 60
    , ¶95.                   "When legal
    standards 'are open to revision in every case, deciding cases
    becomes a mere exercise of judicial will, with arbitrary and
    unpredictable results.'"         State v. City of Oak Creek, 
    2000 WI 9
    ,
    ¶55 n.27, 
    232 Wis. 2d 612
    , 
    605 N.W.2d 526
    (citations omitted).
    ¶132 Our three-tiered deference scheme has suited us well
    over the past decades.              In unnecessarily disowning our well-
    developed     jurisprudence,        the    court      should    at     least    provide
    guidance for the future.              Litigants, circuit courts and the
    court of appeals should not be left adrift to redefine what has
    previously been well-settled.
    ¶133 For the above stated reasons, I respectfully concur.
    ¶134 I     am   authorized    to    state      that     Justice      SHIRLEY   S.
    ABRAHAMSON joins this concurrence.
    9
    No.    2015AP2019.akz
    ¶135 ANNETTE KINGSLAND ZIEGLER, J.                          (concurring).           I agree
    with       the    result    the     court     reaches.              I     concur       and     write
    separately because the analysis that the lead opinion employs to
    reach its conclusions is concerning.                            First, in my view, it is
    both       unnecessary      and     inadvisable            to    rely     on     constitutional
    grounds for ending our practice of deferring to administrative
    agencies'        conclusions        of    law.         Deference          to     administrative
    agencies was a court-created doctrine and, thus, is one that can
    be court eliminated.               We need not reach for the constitution to
    so act.
    ¶136 Second, in interpreting the statute here, the court1
    relies on ordinary meaning to define all of five terms, even
    though two of them have statutory definitions.                                       Additionally,
    the    court       relies     on    the     surplusage            canon    as        grounds     for
    selectively defining necessarily broad terms, even though the
    complete         overlap    between       the        two    statutorily-defined                 terms
    indicates        that   the    legislature            may       well    have         intended    for
    overlap among the undefined terms as well.
    ¶137 Nevertheless, I agree that "'processing' encompasses
    Stuyvesant        Dredging's       separation          of       river   sediment         into    its
    component         parts."          Majority          op.,       ¶104.          Accordingly,        I
    respectfully concur.
    1
    We refer to the opinion as a lead opinion in Part I
    because its constitutional analysis has not garnered the support
    of a majority of the court. We refer to the opinion as that of
    "the court" or as the "majority opinion" in Part II because its
    statutory analysis does have the support of a majority of the
    court.
    1
    No.   2015AP2019.akz
    I.     INTERPRETING AND APPLYING THE LAW
    ¶138 The     lead     opinion   reaches   for   the     constitution
    unnecessarily.      It states as follows:
    As the deference doctrine developed . . . [we did
    not] determine whether this was consistent with the
    allocation of governmental power amongst the three
    branches.   So, as a matter of first impression, we
    consider whether our deference doctrine is compatible
    with our constitution's grant of power to the
    judiciary . . . .
    Lead op., ¶42.      As the lead opinion acknowledges, our deference
    doctrine was a policy of judicial administration,2 and, as such,
    it is not essential to draw on constitutional principles to
    overturn it.     See State v. Castillo, 
    213 Wis. 2d 488
    , 492, 
    570 N.W.2d 44
    (1997) ("An appellate court should decide cases on the
    narrowest possible grounds."); Gabler v. Crime Victims Rights
    Bd., 
    2017 WI 67
    , ¶¶51-53, 
    376 Wis. 2d 147
    , 
    897 N.W.2d 384
    ("This
    court does not normally decide constitutional questions if the
    case can be resolved on other grounds.").           I depart with the
    lead opinion because the doctrine of constitutional avoidance
    requires that we act with restraint.          In accordance with this
    principle, I would not rely on the constitution to overturn our
    judicially-created administrative deference doctrine.
    2
    See, e.g., lead op., ¶34 ("[Great weight deference]
    developed    as     a    home-grown    doctrine     within   the
    judiciary . . . ."); 
    id., ¶70 ("[G]reat
    weight deference is a
    creature of our own making . . . ."); 
    id., ¶40 ("[J]ust
    like
    'great weight' deference, 'due weight' deference has become an
    integral, and therefore unavoidable, part of the framework
    within which we review an administrative agency's conclusions of
    law."); 
    id., ¶3 ("We
    have [] decided to end our practice of
    deferring to administrative agencies' conclusions of law.").
    2
    No.    2015AP2019.akz
    ¶139 Moreover,      departing   from         deference   on   the   basis     of
    judicial       administration     would       not    call   into       question     the
    continuing validity of the decades of cases that have relied on
    the deference doctrine.           In this regard, I disagree with the
    lead opinion's assertions that "[i]f [a decision] [was] final
    upon       release   of   this   opinion,      [its]     finality       will   go    on
    undisturbed by our decision today";3 and that "[c]onsequently
    3
    The lead opinion cites Wis. Stat. § 806.07 in support of
    this assertion, concluding that no paragraph of that statute
    would allow a party to reopen a final judgment based on this
    decision.    Lead op., ¶¶89-91.     To the contrary, the lead
    opinion's conclusion that deference is unconstitutional could
    support an argument for relief from a final judgment under
    § 806.07(1)(a), on the basis of "mistake"; under para. (1)(d),
    on the basis that "[t]he judgment is void"; under para. (1)(f),
    on the basis that "[a] prior judgment upon which the judgment is
    based has been reversed"; or under para. (1)(h), on the basis
    that "[a]ny other reasons justifying relief from the operation
    of the judgment." § 806.07(1)(a), (d), (f), (h).
    The lead opinion attempts to bolster its interpretation of
    § 806.07 by quoting Schauer v. DeNeveu Homeowners Ass'n, Inc.,
    
    194 Wis. 2d 62
    , 75, 
    533 N.W.2d 470
    (1995), for the proposition
    that "'[§ 806.07] does not authorize relief from a judgment on
    the ground that the law applied by the court in making its
    adjudication has been subsequently overruled in an unrelated
    proceeding.'"   Lead op., ¶90 (alteration in original).    To the
    contrary, the court in Schauer concluded that "sec. 806.07(1)(f)
    does not authorize relief from a judgment on the ground that the
    law applied by the court in making its adjudication has been
    subsequently overruled in an unrelated proceeding."      
    Schauer, 194 Wis. 2d at 66
    .     Thus, the lead opinion's implication-by-
    alteration that this case interpreted § 806.07 broadly is error.
    Moreover, Schauer was a case where the parties had reached a
    settlement regarding the scope of an easement wherein they
    allegedly relied on later-overruled case law in reaching the
    settlement.      Thus,  while   arguably   Schauer  decided   the
    application of § 806.07(1)(f) under those circumstances, it does
    not address other subsections of the statute, nor does it
    address every possible application of § 806.07(1)(f).
    (continued)
    3
    No.   2015AP2019.akz
    [the] precedential and controlling effect [of past cases] will
    be the same as if the court had based the decision on its own
    interpretation."       Lead op., ¶¶89, 93.              The lead opinion provides
    no support for these assertions and the constitutional tenor of
    its    analysis    suggests    exactly     the     opposite.          Accordingly,     I
    agree with Justice Ann Walsh Bradley's concurrence that the lead
    opinion fails to adequately account for the effect its analysis
    will have on prior decisions.
    ¶140 Additionally,       it    is       inadvisable      to     turn     to   the
    constitution and address the "core powers" of the judiciary in
    this case.        The lead opinion's "core powers" analysis proceeds
    as    follows:    judicial    power   is       vested    in   the    judiciary;4     the
    doctrine of separation of powers is fundamental to government;5
    the powers of each branch of government fall into one of two
    categories——shared         powers     or        exclusive/core         powers;6      the
    judiciary      has   the     "'exclusive         responsibility            to   exercise
    judgment in cases and controversies arising under the law'";7
    Additionally, the lead opinion's assertion that "overruling
    a case does not expose to collateral attack any of the
    intervening decisions that were based on the overruled case" is
    subject to question.      Lead op., ¶90.      To the contrary,
    overruling one of our prior decisions, can quite obviously have
    significant impact on other cases.
    4
    See lead op., ¶42 (citing Wis. Const. art. VII, § 2).
    5
    See lead op., ¶44 (citing Gabler v. Crime Victims Rights
    Bd., 
    2017 WI 67
    , ¶11, 
    376 Wis. 2d 147
    , 
    897 N.W.2d 384
    ).
    6
    See lead op., ¶46 (citing State v. Horn, 
    226 Wis. 2d 637
    ,
    643, 
    594 N.W.2d 772
    (1999)).
    7
    Lead op., ¶54 (quoting Gabler, 
    376 Wis. 2d 147
    , ¶37).
    4
    No.    2015AP2019.akz
    exercising judgment "encompasses interpreting and applying the
    law to the case . . . ";8 therefore, "only the judiciary may
    authoritatively interpret and apply the law in cases before our
    courts."9         In other words, the judiciary has constitutionally-
    conveyed jurisdiction to interpret and apply the law in cases
    and controversies before the courts.
    ¶141 This conclusion is either quite remarkable or quite
    unremarkable;         that     is,    if    the    lead     opinion   is    breaking     new
    ground       in     defining     the       power       of   the   judiciary,     that    is
    remarkable, but if it is not, there is no need to remark on the
    court's role here because it is not disputed.                           Given that the
    lead       opinion    feels     the    need       to    so-remark,    however,    I     feel
    compelled to caution that its comments should not be read more
    broadly       for     the     proposition          that     the   judiciary     possesses
    exclusive authority to interpret and apply the law generally in
    all arenas.          Although the lead opinion appears to agree that the
    power to interpret and apply the law more generally is shared
    among the branches,10 its definition of the judiciary's "core
    8
    Lead op., ¶54.
    9
    
    Id. 10 For
    example, the lead opinion states as follows:
    The executive must certainly interpret and apply the
    law; it would be impossible to perform his duties if
    he did not. After all, he must determine for himself
    what the law requires (interpretation) so that he may
    carry it into effect (application).   Our constitution
    not only does not forbid this, it requires it.    Wis.
    Const. art. V, § 1 ("The executive power shall be
    vested in a governor . . . ."); Perez v. Mortg.
    Bankers Ass'n, 
    135 S. Ct. 1199
    , 1217 (2015) (Thomas,
    (continued)
    5
    No.    2015AP2019.akz
    power," 
    see supra
    ¶140, is applied more broadly at times such
    that it could be read to abrogate the shared nature of the power
    to interpret and apply the law.11               This lead opinion is not to be
    read so broadly.
    ¶142 In sum, I would not reach the constitutional issue
    because     reversal      on   judicial    administration        grounds    is   more
    appropriate: that which the court administratively gives, the
    court can administratively take away, and doing so on the basis
    of    judicial     administration       would    not   require    undermining     the
    decades     of    cases    that   did     rely    on    the   deference     doctrine
    because, at the time, it was our policy to do so.                      Additionally,
    the    lead      opinion's     conclusions       on    constitutional      grounds——
    regarding the judiciary's core powers——should be read as limited
    to    the     unremarkable      reiteration       of    our   responsibility       to
    interpret and apply the law in cases and controversies before
    the courts.
    J., concurring) ("It is undoubtedly true that the
    other branches of Government have the authority and
    obligation to interpret the law . . . .").
    Lead op., ¶53.
    11
    See, e.g., lead op., ¶54 (citing Operton v. LIRC, 
    2017 WI 46
    , ¶73, 
    375 Wis. 2d 1
    , 
    894 N.W.2d 426
    (R. Grassl Bradley, J.,
    concurring)) ("'[T]he court's duty to say what the law is'
    constitutes a 'core judicial function.'"); 
    id., ¶70 (citing
    Wis.
    Stat. § 227.57(5)) ("[T]he statute says the court is to decide
    whether the agency has 'erroneously interpreted a provision of
    law.' And the court is to determine the 'correct interpretation
    of the provision of law.'       This formulation recognizes the
    proper residence of our core judicial powers."); 
    id., ¶¶73-74 (implying
    that an agency's interpretation and application of the
    law is an exercise of "our power.").
    6
    No.    2015AP2019.akz
    II.    INTERPRETING AND APPLYING WIS. STAT. § 77.52(2)(a)11.
    ¶143 I also write because I do not agree with the court's
    redefining terms that the legislature has statutorily defined.
    Specifically,            the        legislature            defines      "printing"         and
    "imprinting."                 See      Wis.     Stat.          § 77.51(11).          Without
    acknowledging            or     attempting           to        incorporate     these       two
    statutorily-defined             terms    into       its    analysis,    the    court   first
    turns to ordinary meaning (i.e., dictionaries) in interpreting
    and    applying       Wis.     Stat.     § 77.52(2)(a)11.              While    it    is   not
    improper      for     the      court    to    turn        to   the   dictionary      for   the
    undefined terms, I take issue with the court turning to the
    dictionary       to      redefine       "printing"         and    "imprinting"——the        two
    statutory terms.              In so doing, the court also overstates the
    necessity of avoiding surplusage because the legislature here
    has    defined      at    least     some      terms——printing         and    imprinting——to
    entirely overlap.              In the end, this is a taxation statute; it
    could very well be that the legislature wanted to leave little
    room for exclusion from taxation.
    A.    Specially-Defined Terms:                Printing and Imprinting
    ¶144 The legislature provided definitions for two of the
    five    terms    at      issue——printing            and    imprinting——and       those     two
    7
    No.    2015AP2019.akz
    statutorily-defined terms completely overlap.12                However, in an
    effort    to   ensure   that    each   term    "retain[s]      an     independent
    meaning," that is, "has at least one attribute distinct from the
    others," majority op., ¶101, the court makes no mention of the
    legislatively-provided          definitions,      but        instead      selects
    dictionary definitions that support its analysis.                   Majority op.,
    ¶100.     I find that to be contrary to our prescribed method of
    statutory interpretation.
    ¶145 To start, Wis. Stat. § 990.01(1) provides:                   "All words
    and phrases shall be construed according to common and approved
    usage; but technical words and phrases and others that have a
    peculiar meaning in the law shall be construed according to such
    meaning."      Similarly, State ex rel. Kalal v. Circuit Court for
    Dane County states:        "Statutory language is given its common,
    ordinary,      and   accepted    meaning,     except    that        technical   or
    specially-defined words or phrases are given their technical or
    special     definitional       meaning."       
    2004 WI 58
    ,     ¶45,     
    271 Wis. 2d 633
    , 
    681 N.W.2d 110
    ; see also Antonin Scalia & Bryan A.
    12
    The five terms at issue are "processing," "producing,"
    "fabricating," "printing," and "imprinting."       "Printing" and
    "imprinting" are defined by statute, see Wis. Stat. § 77.51(11);
    "processing," "producing," and "fabricating" are not. The court
    argues that § 77.51(11), despite being a subsection of the
    "Definitions" section of the statute, does not provide a
    definition    because   it  provides   no  "useful   information."
    Majority op., ¶102 n.51.     As noted below, see infra ¶145, note
    14, the fact that the court finds the statutory definition
    unhelpful in conducting its preferred analysis is not a reason
    to ignore it.      Moreover, to the contrary, § 77.51(11) does
    provide    useful   information,   namely,  a   measure   of   the
    legislature's comfort with overlap. See infra ¶149.
    8
    No.   2015AP2019.akz
    Garner, Reading Law: The Interpretation of Legal Texts 69-77
    (2012) ("Ordinary-Meaning Canon") ("Words are to be understood
    in     their    ordinary,       everyday       meanings——unless           the    context
    indicates that they bear a technical sense.").
    ¶146 Under      the   statute,     "printing"      and      "imprinting"      are
    specially       defined:        "'Printing'       and     'imprinting'           include
    lithography,           photo-lithography,             rotogravure,              gravure,
    letterpress, silk screen printing, multilithing, multigraphing,
    mimeographing,      photostating,         steel   die    engraving        and    similar
    processes."      Wis. Stat. 77.51(11) (2007-08).13                 Nevertheless, the
    court states as follows:
    "[P]rinting" means "[t]o make or produce (text, a
    book, a picture, etc.) by a mechanical process
    involving the transfer of characters or designs on to
    paper, vellum, etc."     Printing, The Oxford English
    Dictionary      (2d      ed.     1989)      (definition
    II.8.a.). . . . "[I]mprinting" means "[t]o mark by
    pressure; to impress, stamp," "[t]o impress (letters
    or characters) on paper or the like by means of type,"
    and "[t]o make an impression or impressed figure upon;
    to stamp or impress (something) with a figure, etc."
    Imprinting, The Oxford English Dictionary (2d ed.
    1989) (definitions 1.a., 2., and 4.a., respectively).
    Majority op., ¶100.             This reliance on ordinary meaning (i.e.,
    dictionaries)     is     contrary    to    statute      and   to    the    common    law
    because "printing" and "imprinting" are specially defined.                           See
    Wis.    Stat.   § 990.01(1);        Kalal,     
    271 Wis. 2d 633
    ,        ¶45.      But,
    despite the clarity of the law in this area, the court gives no
    consideration       to    the     synonymous,        statutory      definition       and
    13
    "Printing" and "imprinting" are also specially defined in
    this manner in the 2005-06 version of the statute. See majority
    op., ¶2 n.2.
    9
    No.     2015AP2019.akz
    instead favors dual dictionary definitions.                       Doing so does aid
    its   analysis   in    at     least     two      ways,14    but   the      legislatively
    defined terms cannot be ignored for the sake of convenience.
    Moreover,     further        analysis       reveals        that    relying         on   the
    synonymous statutory definitions is not fatal to the court's
    result     because    such    overlap       is    likely    what     the     legislature
    intended.
    B.     Surplusage
    ¶147 The court understandably struggles with distinguishing
    "processing,"    "producing,"         and     "fabricating."            As    an   initial
    matter, these terms are not statutorily defined.                           And, although
    normally this would not present great difficulty——as resort to
    dictionaries for ordinary meaning is appropriate where terms are
    not statutorily defined——here, even the dictionary definitions
    have significant overlap.             (How would one produce or fabricate
    something without putting it through a process?)                        But instead of
    acknowledging    this    overlap,       the      court     reaches      to   distinguish
    these terms in order to avoid surplusage.                          Such artifice is
    unnecessary in my view.           First, surplusage need not be avoided
    14
    First, the statutory definition is illustrative rather
    than descriptive.   Thus, reliance on the statutory definition
    would impair the court's analysis because it would not provide a
    useful   comparison  to   the  court's   descriptive  dictionary
    definitions of "producing" and "fabricating." See majority op.,
    ¶100.   Second, the statute defines "printing" and "imprinting"
    as synonyms, that is, their statutory definition overlaps in its
    entirety.    Thus, reliance on the statutory definition would
    impair the court's analysis because it would contravene the
    court's conclusion that each term "retain[s] an independent
    meaning" because "it has at least one attribute distinct from
    the others." Majority op., ¶101.
    10
    No.   2015AP2019.akz
    at     all     costs.        Second,      not        all       overlap       is     surplusage,
    particularly where, as here, the plain meaning of the terms and
    the synonymous nature of coordinate, legislatively-defined terms
    invites overlapping interpretations.                           Third, regardless of the
    amount of overlap, Stuyvesant Dredging's actions fall within the
    definition of "processing."               Again, in a taxation statute, where
    generally the legislature is trying to include, not exclude,
    those who will be subject to taxation, such a broad sweep is
    unsurprising.
    ¶148 While         avoiding       surplusage             is     generally       favored,
    surplusage need not be avoided at all costs.                                   Kalal states:
    "Statutory language is read where possible to give reasonable
    effect       to   every    word,    in   order           to   avoid     surplusage."         
    271 Wis. 2d 633
    , ¶46 (emphasis added); see also Scalia & 
    Garner, supra
    ¶144 at 174-79 ("Surplusage Canon") ("If possible, every
    word     and      every    provision      is        to    be     given      effect . . . .")
    (emphasis added).           Thus, it is not true that "we must understand
    'processing' to bear a meaning that does not displace all of the
    other        descriptors . . . ."              Majority              op.,    ¶101     (emphasis
    added).15
    ¶149 Additionally, in my view, it may not be possible to
    avoid       complete      overlap    among      "processing,"               "producing,"     and
    15
    In this regard, I do not disagree that "[w]e must make
    our best effort at determining the specific meaning," majority
    op., ¶103 n.51 (emphasis added); rather, in my view, no effort——
    other than one to rewrite the statute——can overcome the plain
    and broad meaning of the terms used by the legislature here.
    See infra ¶¶148, 150-153.
    11
    No.   2015AP2019.akz
    "fabricating," because the ordinary meaning of "processing" is
    so   broad.16       But    the    fact    that    an    abstract     definition     of
    "processing"       could    encompass     the    abstract   definitions       of   the
    other statutory terms does not necessarily displace them, as
    their use might be more appropriate in certain contexts.                           For
    example, on the one hand, we think of films as being "produced"
    and some stories as being "fabricated," even though no one would
    dispute that making a film or making up a story is a process.
    On   the   other    hand,    we   think    of    some    foods——American       cheese
    slices, for example——as being "processed."
    ¶150 In other words, surplusage is not to be assumed merely
    because the legislature has used a broad term.                  See Pawlowski v.
    Am. Family Mut. Ins. Co., 
    2009 WI 105
    , ¶22, 
    322 Wis. 2d 21
    , 
    777 N.W.2d 67
    ("The use of different words joined by the disjunctive
    connector 'or' normally broadens the coverage of the statute to
    reach distinct, although potentially overlapping sets.")                           This
    is perhaps particularly true where, as here, the legislature has
    invited     such     overlapping         interpretations       by        specifically
    defining two of the terms as synonyms.                  See Georgina G. v. Terry
    M., 
    184 Wis. 2d 492
    , 540, 
    516 N.W.2d 678
    (1994) (Bablitch, J.,
    dissenting) ("The legislature at times, as here, deliberately
    16
    In this regard, I note that the court's conclusion that
    "processing" is "a task       that can be completed without
    transforming the property into a new product, or adding anything
    to it that was not already there" does not avoid displacing
    "producing" and "fabricating."      Majority op., ¶103.     Just
    because "processing" encompasses tasks that are not "producing"
    or   "fabricating"   does   not   mean   that   "producing"  and
    "fabricating" are not subordinate forms of "processing."
    12
    No.   2015AP2019.akz
    paints    with    a   very    broad . . . brush.");         see    also      Scalia   &
    
    Garner, supra
    ¶144 at 174 ("[I]t is no more the court's function
    to revise by subtraction than by addition.").
    ¶151 Regardless of the amount of overlap, under a plain
    meaning        analysis      Stuyvesant     Dredging's       work        constituted
    "processing,"         as     that   term     is      used     in        Wis.     Stat.
    § 77.52(2)(a)11.           We begin with the language of the statute.
    Kalal, 
    271 Wis. 2d 633
    , ¶45.               The statute states in relevant
    part as follows:
    (2) For the privilege of selling, performing or
    furnishing the services described under par. (a) at
    retail in this state to consumers or users, a tax is
    imposed upon all persons selling, performing or
    furnishing the services at the rate of 5% of the gross
    receipts from the sale, performance or furnishing of
    the services.
    (a)    The tax imposed herein                     applies      to     the
    following types of services: . . .
    11.    The producing, fabricating, processing,
    printing or imprinting of tangible personal property
    for a consideration for consumers who furnish directly
    or indirectly the materials used in the producing,
    fabricating, processing, printing or imprinting. This
    subdivision does not apply to the printing or
    imprinting of tangible personal property that results
    in printed material, catalogs, or envelopes that are
    exempt under s. 77.54 (25) or (25m).
    § 77.52(2)(a)11.
    ¶152 "Processing"          is   not    defined    in    the    statute,      thus,
    resort    to    dictionary     definitions    is     not   inappropriate.            See
    Kalal, 
    271 Wis. 2d 633
    , ¶45 ("Statutory language is given its
    common, ordinary, and accepted meaning . . . .").                       "Processing"
    is defined in dictionaries as follows: (1) "to subject to a
    special process or treatment"; "to subject to or handle through
    13
    No.    2015AP2019.akz
    and established usually routine set of procedures";17 (2) "to put
    through     the   steps    of    a    prescribed     procedure";        "to   prepare,
    treat, or convert by subjecting to a special process";18 (3)
    "[t]o subject to or treat by a special process; to operate on
    mechanically or chemically."19
    ¶153 In       my   view,        Stuyvesant      Dredging's    separation       of
    dredged materials plainly falls under any of these definitions
    of "processing."          "If the meaning of the statute is plain, we
    ordinarily stop the inquiry."               Kalal, 
    271 Wis. 2d 633
    , ¶45.           And
    I   would    reiterate      that      the     fact   that   the    definition       of
    "processing" is broad does not mean that it is ambiguous, nor
    does it render the statute meaningless.                     See Kernz v. J. L.
    French    Corp.,    2003    WI       App    140,   ¶16,   
    266 Wis. 2d 124
    ,       
    667 N.W.2d 751
    ("[A] phrase is not ambiguous simply because it is
    general or broad."); see also Zarnstorff v. Neenah Creek Custom
    Trucking, 
    2010 WI App 147
    , ¶21, 
    330 Wis. 2d 174
    , 
    792 N.W.2d 594
    (quoting Lawver v. Boling, 
    71 Wis. 2d 408
    , 422, 
    238 N.W.2d 514
    (1976)) ("[A]n otherwise unambiguous provision is not rendered
    ambiguous simply because it is difficult to apply to the facts
    of a particular case.").
    17
    Process merriam-webster.com, (search "processing") (verb)
    (last visited May 11, 2018).
    18
    Process ahdictionary.com, (search "processing") (tr. v.)
    (last visited May 11, 2018).
    19
    Majority op., ¶103 (quoting Processing The Oxford English
    Dictionary (2d ed. 1989) (definition 3.a.)).
    14
    No.    2015AP2019.akz
    ¶154 In sum, the plain language of the statute compels the
    conclusion        that,          in     the     Venn            diagram        of     definitions,
    "processing"          is    the       paper   on     which       overlapping           circles    for
    "producing" and "fabricating" are drawn.                                 This, however, does
    not mean that Stuyvesant Dredging's work cannot be understood as
    falling within the plain meaning of "processing."
    IV.    CONCLUSION
    ¶155 I agree with the result the court reaches.                                      I concur
    and write separately because the analysis that the lead opinion
    employs to reach its conclusions is concerning.                                       First, in my
    view,     it     is    both       unnecessary            and     inadvisable          to   rely    on
    constitutional grounds for ending our practice of deferring to
    administrative             agencies'      conclusions            of     law.          Deference    to
    administrative agencies was a court-created doctrine and, thus,
    is one that can be court eliminated.                            We need not reach for the
    constitution to so act.
    ¶156 Second, in interpreting the statute here, the court
    relies on ordinary meaning to define all of five terms, even
    though two of them have statutory definitions.                                        Additionally,
    the     court     relies         on    the     surplusage          canon       as     grounds     for
    selectively defining necessarily broad terms, even though the
    complete        overlap       between         the        two    statutorily-defined              terms
    indicates       that       the    legislature             may    well     have        intended    for
    overlap among the undefined terms as well.
    ¶157 Nevertheless, I agree that "'processing' encompasses
    Stuyvesant       Dredging's            separation         of     river    sediment         into   its
    15
    No.   2015AP2019.akz
    component   parts."    Majority    op.,   ¶104.   Accordingly,      I
    respectfully concur.
    ¶158 I am authorized to state that Chief Justice PATIENCE
    DRAKE ROGGENSACK joins Part I of this concurrence.
    16
    No.    2015AP2019.mjg
    ¶159 MICHAEL J. GABLEMAN, J.                 (concurring).        I agree that
    we    should   no   longer    give    deference       to    administrative      agency
    conclusions of law and that the services provided by Stuyvesant
    Dredging constitute "processing" under Wis. Stat.                         § 77.52(2).
    However, unlike the lead opinion, I would apply the doctrine of
    constitutional avoidance and eliminate deference by withdrawing
    the language in Harnischfeger Corp. v. LIRC, 
    196 Wis. 2d 650
    ,
    
    539 N.W.2d 98
        (1995),    that      indicated     deference     is     mandatory.
    Specifically, I would withdraw the following two sentences:                          (1)
    "courts        should      defer      to       an     administrative          agency's
    interpretation of a statute in certain situations," 
    id. at 660;
    and (2) "[o]nce it is determined under Lisney that great weight
    deference      is   appropriate,      we    have      repeatedly     held     that   an
    agency's interpretation must then merely be reasonable for it to
    be sustained,"          
    id. at 661.1
              I would withdraw this language
    because the Harnischfeger court's use of the word "should" in
    the    first    sentence     did   not     expose     the   mandatory       nature   of
    deference, which does not appear until the second sentence with
    its use of the word "must."              In so doing, I would thereby avoid
    addressing the issue on constitutional grounds.2
    1
    By implication, which I now make express, my analysis and
    conclusion apply just as strongly to due weight deference.
    2
    Accordingly, I join the following parts of the majority
    opinion: ¶¶1-3, I, II (intro), II.A. (intro), II.A.1., II.A.2.,
    II.A.6., II.B., III, and the mandate.   To the extent the first
    sentence of ¶84 implies a holding on constitutional grounds, I
    do not join it.
    1
    No.    2015AP2019.mjg
    ¶160 Constitutional avoidance is a subset of the axiom that
    "[a]n    appellate      court   should     decide      cases    on    the     narrowest
    possible grounds."        State v. Castillo, 
    213 Wis. 2d 488
    , 492, 
    570 N.W.2d 44
    (1997).        "Consistent with this rule is the recognition
    that a court will not reach constitutional issues where the
    resolution of other issues disposes of an appeal."                         
    Id. In the
    present case, we need not determine whether our constitution
    prohibits deference because deference is nothing more than a
    judicial    construct      based    on     our    misreading         of    Wis.    Stat.
    § 227.57(10).      See lead op., ¶¶27-32.
    ¶161 As    the   lead    opinion       aptly    explains,      the     deference
    doctrine is a beast of our creation——neither the legislature nor
    executive purported to require that we apply deference.                               See
    lead op., ¶¶18-33.          Therefore, we are free to dispense with
    deference as simply as we adopted it.                  See Holytz v. Milwaukee,
    
    17 Wis. 2d 26
    , 37, 
    115 N.W.2d 618
    (1962), superseded by statute,
    Wis. Stat. § 893.80.
    ¶162 We created deference through a continued misreading of
    Wis.    Stat.    § 227.57(10),     which      culminated       in    our    holding   in
    
    Harnischfeger, 196 Wis. 2d at 661
    , that deference is required,
    not merely an aid in statutory interpretation.                        See lead op.,
    ¶¶27-33.    We can (and therefore should) remedy this misreading
    without invoking the constitution.                    Johnson Controls, Inc. v.
    Emplrs. Ins., 
    2003 WI 108
    , ¶99, 
    264 Wis. 2d 60
    , 
    665 N.W.2d 257
    ;
    see also lead op., ¶¶82-83.
    ¶163 The lead opinion briefly states the five traditional
    factors we use when deciding whether to overrule one of our
    2
    No.    2015AP2019.mjg
    prior    decisions,       lead   op.,    ¶82,    and     then    just     as    briefly
    concludes that our prior decisions regarding deference must be
    overruled based solely on their unconstitutional holdings, 
    id., ¶83. Our
        authority      to   withdraw        language    from    our     prior
    decisions alone is sufficient to the task and the lead opinion's
    invocation of the constitution in this context is an unnecessary
    and imprudent addition to its substantive analysis.
    I.     THE TRADITIONAL FIVE CIRCUMSTANCES FOR OVERTURNING PRECEDENT
    ¶164 We are "more likely to overturn a prior decision when
    one or more of the following circumstances is present":
    (1) Changes or developments in the law have undermined
    the rationale behind a decision;
    (2) There is a need to make a decision correspond to
    newly ascertained facts;
    (3) There is a showing that the precedent has become
    detrimental to coherence and consistency in the law;
    (4) The prior decision is "unsound in principle;" or
    (5) The prior decision is "unworkable in practice."
    Bartholomew v. Wis. Patients Comp. Fund, 
    2006 WI 91
    , ¶33, 
    293 Wis. 2d 38
    ,       
    717 N.W.2d 216
        (quoting       Johnson     Controls,        
    264 Wis. 2d 60
    , ¶¶98-99).            I discuss these five "circumstances" in
    order of how strongly they apply to deference.
    A.    The Prior Decision is "Unsound in Principle"
    ¶165 The    fourth     circumstance       is    especially       present     with
    regard    to    deference     and     strongly    supports       our     decision    to
    eliminate it.           Deference is simply unsound in principle.                    In
    theory, deference should make courts' decision-making easier and
    more efficient.          See The Honorable Patience Drake Roggensack,
    3
    No.     2015AP2019.mjg
    Elected to Decide: Is the Decision-Avoidance Doctrine of Great
    Weight Deference Appropriate in This Court of Last Resort?, 89
    Marq. L. Rev. 541, 544 (2006).             In practice, however, deference
    does not save significant court resources.                  Because the level of
    deference afforded is often outcome-determinative, 
    id. at 559,
    parties and courts often expend just as much effort arguing and
    deciding the proper level of deference as they would the merits,
    see, e.g., Emmpak Foods, Inc. v. LIRC, 
    2007 WI App 164
    , ¶¶3-8,
    
    303 Wis. 2d 771
    , 
    737 N.W.2d 60
    .               Thus, deference often hinders
    rather than helps meaningful judicial review while providing no
    corresponding benefit.           See generally Brown v. LIRC, 
    2003 WI 142
    , ¶¶10-19, 
    267 Wis. 2d 31
    , 
    671 N.W.2d 279
    ("Our analysis in
    this case centers around the standard of review.").
    ¶166 Importantly,         deference       (especially         great        weight
    deference),    if   correctly      and    honestly     applied,     leads      to   the
    perverse      outcome      of     courts       often        affirming         inferior
    interpretations of statutes.              See, e.g., 
    id., ¶44 ("Were
    this
    court reviewing the order of LIRC de novo, the result might very
    well be different.").           In our role as court of last resort, we
    should   ensure     that   erroneous-but-reasonable            legal     conclusions
    are   corrected.        See    Hilton    v.    DNR,    
    2006 WI 84
    ,     ¶54,    
    293 Wis. 2d 1
    ,    
    717 N.W.2d 166
         (Prosser,        J.,     concurring).          Any
    doctrine   that     allows     erroneous      legal   conclusions        to   survive
    unscathed is unsound in principle.
    B.   The Need to Make a Decision Correspond to Newly Ascertained
    Facts
    ¶167 The    second      circumstance     also    applies      in    this    case,
    though to a lesser extent.               Deference is based on the theory
    4
    No.       2015AP2019.mjg
    that administrative agencies develop expertise in their realm.
    Barron Elec. Coop. v. PSC, 
    212 Wis. 2d 752
    , 759, 
    569 N.W.2d 726
    (Ct.     App.       1997)        ("[A]n . . . important                   principle        of
    administrative law is that, in recognition of the expertise and
    experience possessed by agencies, courts will defer to their
    interpretation of statutes in certain situations."); see also
    DOR v. Menasha Corp., 
    2008 WI 8
    , ¶¶48-50, 
    311 Wis. 2d 579
    , 
    754 N.W.2d 95
    .        However,       we     do    not     scrutinize      whether         agency
    decision-makers actually possess any expertise.                             For example,
    some agency decisions are made by a single hearing examiner——of
    unknown expertise or experience.                   
    Roggensack, supra
    ¶7, at 557.
    Further, under the erstwhile deference construct, it is possible
    for    multi-member       agency      review        boards    to    lack        substantial
    experience or expertise.              
    Id. at 558
    (questioning whether LIRC
    commissioners who served, on average, 3.7 years each between
    1979 and 2004 possessed more expertise in interpreting statutes
    than   courts).          We    may    say     that    it     is    only     a    matter    of
    speculation that agency decision-makers possess less expertise
    than   courts     when    it    comes    to       interpreting      various        statutes.
    Importantly, it is equally a matter of speculation that they
    possess more.       Such is not the kind of foundation upon which
    sound judicial doctrines are built.
    C.    The Other Circumstances
    ¶168 The    first,       third,       and     fifth   circumstances           do   not
    substantially apply in this case.                    Though, for purposes of the
    first circumstance, we may be able to infer that the legislature
    disapproves of deference based on its enactment of Wis. Stat.
    5
    No.   2015AP2019.mjg
    § 227.57(11),       such     an     inference          is     too     weak       to     support
    overruling     decades      of    prior        decisions.             As    to    the     third
    circumstance, deference is intended to maintain consistency in
    the   law,   though   it     is     a    matter       of    reasonable       debate      as   to
    whether it achieves that goal.                      Hilton, 
    293 Wis. 2d 1
    , ¶¶64-65
    (Prosser, J., concurring).                    Finally, despite its many flaws,
    deference is certainly workable in practice for purposes of the
    fifth circumstance.
    II.     CONCLUSION
    ¶169 Clearly, "one or more of the [listed] circumstances is
    present"     such   that     we     can       and    should    end     our       practice     of
    deferring to administrative agency conclusions of law without
    invoking the constitution.               Bartholomew, 
    293 Wis. 2d 38
    , ¶33.                     I
    would,   therefore,        follow       the    law    and     apply    the       doctrine     of
    constitutional avoidance in order to decide this case on the
    narrowest     possible      grounds.            For    the     foregoing         reasons,      I
    respectfully concur.
    ¶170 I am authorized to state that Chief Justice PATIENCE
    DRAKE ROGGENSACK joins this concurrence.
    6
    No.   2015AP2019.mjg
    1