Usw v. Conocophillips Company ( 2010 )


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  •                    FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    UNITED STEEL, PAPER & FORESTRY,          
    RUBBER, MANUFACTURING ENERGY,
    ALLIED INDUSTRIAL & SERVICE
    WORKERS INTERNATIONAL UNION,
    AFL-CIO, CLC, On behalf of its
    members employed by defendants;
    RAUDEL COVARRUBIAS, individually
    and on behalf of all similarly
    situated current and former                     No. 09-56578
    employees; DAVID SIMMONS,
    individually and on behalf of all                 D.C. No.
    2:08-cv-02068-PSG-
    similarly situated current and
    FFM
    former employees; STEPHEN S.
    SWADER Sr., individually and on
    behalf of all similarly situated
    current and former employees,
    Plaintiffs-Appellants,
    v.
    CONOCOPHILLIPS COMPANY,
    Defendant-Appellee.
    
    377
    378             UNITED STEEL v. CONOCOPHILLIPS
    UNITED STEEL, PAPER & FORESTRY,          
    RUBBER, MANUFACTURING ENERGY,
    ALLIED INDUSTRIAL & SERVICE
    WORKERS INTERNATIONAL UNION,
    AFL-CIO, CLC, On behalf of its
    members employed by defendants;
    RAUDEL COVARRUBIAS, individually
    and on behalf of all similarly
    No. 09-56579
    situated current and former
    employees; DAVID SIMMONS,                          D.C. No.
    individually and on behalf of all           2:08-cv-02068-PSG-
    similarly situated current and                       FFM
    former employees; STEPHEN S.                      OPINION
    SWADER Sr., individually and on
    behalf of all similarly situated
    current and former employees,
    Plaintiffs-Appellees,
    v.
    CONOCOPHILLIPS COMPANY,
    Defendant-Appellant.
    
    Appeal from the United States District Court
    for the Central District of California
    Philip S. Gutierrez, District Judge, Presiding
    Argued and Submitted
    November 4, 2009—Pasadena, California
    Filed January 6, 2010
    Before: Thomas G. Nelson, Jay S. Bybee, and
    Milan D. Smith, Jr., Circuit Judges.
    Opinion by Judge Bybee
    UNITED STEEL v. CONOCOPHILLIPS              381
    COUNSEL
    Anne Richardson, Hadsell, Stormer, Keeny, Richardson &
    Renick, LLP, Pasadena, California, for plaintiffs-appellants-
    appellees Raudel Covarrubias, David Simmons, and Stephen
    S. Swader, Sr.
    Robert A. Cantore, Gilbert & Sackman, Inc., Los Angeles,
    California, for plaintiff-appellant-appellee United Steel, Paper
    & Forestry, Rubber, Manufacturing, Energy, Allied Industrial
    & Service Workers International Union, AFL-CIO, CLC.
    Rex S. Heinke, Akin Gump Strauss Hauer & Feld, LLP, Los
    Angeles, California, for defendant-appellant-appellee Cono-
    coPhillips Co.
    OPINION
    BYBEE, Circuit Judge:
    These consolidated appeals raise two issues: first, whether
    the district court abused its discretion when it denied plain-
    tiffs’ motion to certify a putative class out of concern that
    practical obstacles could potentially develop if plaintiffs’
    legal theory were ultimately rejected; and second, whether the
    district court erred in remanding, in light of its certification
    decision, state law claims to state court for lack of subject
    matter jurisdiction. We hold that the district court abused its
    discretion when it assumed, for the purpose of Federal Rule
    of Civil Procedure 23 certification analysis and without any
    separate inquiry into the merits, that plaintiffs’ legal theory
    would fail. Accordingly, we reverse and remand for reconsid-
    eration of plaintiffs’ certification motion and dismiss as moot
    the appeal of the remand order.
    382                UNITED STEEL v. CONOCOPHILLIPS
    I
    Defendant ConocoPhillips Company is an international oil
    company that operates oil refineries in Los Angeles,1 Santa
    Maria, and Rodeo, California. United Steel, Paper & Forestry,
    Rubber, Manufacturing, Energy, Allied Industrial & Service
    Workers International Union, AFL-CIO, CLC (“USW”) is a
    labor union that represents many of the employees who work
    at ConocoPhillips’ refineries. ConocoPhillips and USW are
    parties to a collective bargaining agreement that sets forth
    wages, hours, and working conditions for USW-represented
    employees at ConocoPhillips’ California refineries.
    On February 15, 2008, USW and representative plaintiffs
    David Simmons, Raudel Covarrubias, and Stephen Swader2
    filed a class action complaint against ConocoPhillips and ten
    John Doe Defendants in Los Angeles Superior Court. The
    complaint sought “class-wide relief under California law for
    defendants’ breaches of their legal obligation to provide
    employees with unpaid, 30-minute meal periods, totally
    relieved of all duties, for every 5 hours of work.” The basic
    premise of plaintiffs’ complaint was that because operators
    cannot leave their units during their meal breaks and are sub-
    ject to interruptions to which they must respond, their meal
    periods are “on duty” within the meaning of California law.3
    Plaintiffs sought both damages and injunctive relief.
    1
    ConocoPhillips’ Los Angeles refinery is composed of two linked facili-
    ties located approximately five miles apart in Carson and Wilmington.
    2
    The representative plaintiffs are various types of operators at the Los
    Angeles and Santa Maria ConocoPhillips refineries. No representative
    plaintiff is a laboratory employee, nor does any representative plaintiff
    work at the Rodeo refinery.
    3
    In order for an “on duty” meal period to be permissible under Califor-
    nia law, all three of the following conditions must be met: (1) the nature
    of the work must prevent the employee from being relieved of all duty
    during the meal period; (2) the employee and employer must have entered
    into a written agreement authorizing an on duty meal period; and (3) the
    UNITED STEEL v. CONOCOPHILLIPS                        383
    On March 27, 2008, ConocoPhillips removed the action to
    the United States District Court for the Central District of Cal-
    ifornia, citing the Class Action Fairness Act of 2005
    (“CAFA”), Pub. L. No. 109-2, 119 Stat. 4 (codified at 28
    U.S.C. §§ 1332(d), 1453, 1711-15), as the basis for federal
    subject matter jurisdiction. CAFA vests a district court with
    original jurisdiction over “a class action” where: (1) there are
    one-hundred or more putative class members; (2) at least one
    class member is a citizen of a state different from the state of
    any defendant; and (3) the aggregated amount in controversy
    exceeds $5 million, exclusive of costs and interest. 28 U.S.C.
    §§ 1332(d)(2), (5)(B), (6). In its notice of removal, Cono-
    coPhillips stated that “Plaintiffs, at the time this action was
    commenced, were citizens and residents of the State of Cali-
    fornia,” while ConocoPhillips, as a Delaware corporation with
    its principal place of business in Texas, was not a citizen of
    California under 28 U.S.C. § 1332(c)(1). Plaintiffs did not
    contest removal.
    After removal, the parties proceeded with discovery, and in
    early 2009, plaintiffs moved for class certification under Fed-
    eral Rule of Civil Procedure 23. The putative class encom-
    passed
    all former, current, and future non-exempt hourly
    employees of Defendant ConocoPhillips who, at any
    time since February 15, 2004, worked as an Operator
    written agreement must expressly state that the employee may, in writing,
    revoke the agreement at any time. Cal. Code Regs. tit. 8, § 11010, subd.
    11(C); see also DLSE Opinion Letter 2002-09-04.
    The specifics of the labor dispute underlying plaintiffs’ suit are not rele-
    vant to the certification question at issue in this appeal. However, the gra-
    vamen of plaintiffs’ complaint is that because operators at
    ConocoPhillips’s California refineries must respond to their radios and to
    any audible alarms throughout their twelve-hour shifts, any meal breaks
    operators take are “on duty” under California law and must be compen-
    sated as such.
    384                UNITED STEEL v. CONOCOPHILLIPS
    or in the laboratory on a shift schedule at a Cono-
    coPhillips refinery located in Los Angeles, Santa
    Maria, or Rodeo, California.
    On March 16, 2009, the district court denied class certifica-
    tion, but did so without prejudice. In this order, the district
    court held that although plaintiffs had demonstrated the exis-
    tence of three of the four Rule 23(a) prerequisites to class cer-
    tification — numerosity, commonality, and typicality, see
    Fed. R. Civ. P. 23(a)(1)-(3) — plaintiffs failed to satisfy the
    “adequate representation” requirement under Rule 23(a)(4).
    Specifically, the district court held that due to counterclaims
    then pending against USW, “USW’s interests [we]re not
    properly aligned with those of the class” and that because
    then-class counsel also represented USW, “it could not ade-
    quately represent the interests of the class.”
    After the March 2009 order, the representative plaintiffs
    obtained new counsel unrelated to USW, USW successfully
    moved for Rule 12(b)(6) dismissal of all pending counter-
    claims against it, and plaintiffs renewed their motion for class
    certification under Rule 23. In an order dated June 11, 2009,
    the district court again denied class certification. The district
    court held that plaintiffs had satisfied all four requirements of
    Rule 23(a), but failed to satisfy any of the three provisions in
    Rule 23(b).4 The court held that although plaintiffs had relied
    on both Rule 23(b)(2) and Rule 23(b)(3) in support of class
    certification, plaintiffs had not carried their burden of satisfy-
    ing either of these provisions. With respect to Rule 23(b)(3),
    the so-called “predominance” requirement, the district court
    reasoned that “if Plaintiffs’ ‘on duty’ theory is rejected . . . the
    Court will be faced with a case . . . requiring individualized
    trials on each class member’s meal period claims,” and “a
    4
    Although a putative class must satisfy all four requirements of Rule
    23(a) to achieve certification, the three provisions of Rule 23(b) are dis-
    junctive: a class can be certified where it satisfies only one Rule 23(b)
    requirement.
    UNITED STEEL v. CONOCOPHILLIPS                      385
    class action w[ould] not be the superior method of resolving
    this suit.” The court ultimately held that “this problem . . . is
    an insurmountable barrier to class certification,” and therefore
    “decline[d] to certify the class under Rule 23(b)(3).”
    The same day it issued the order denying certification, the
    district court remanded this action to Los Angeles Superior
    Court. The district court explained that “district courts are
    split on the issue” of whether remand is required after denial
    of class certification and noted that “[t]he Ninth Circuit has
    never addressed this question,” before ultimately concluding:
    In the instant case there is no “reasonably foresee-
    able possibility” that a class will be certified, given
    that Plaintiffs have brought two unsuccessful certifi-
    cation motions and that insurmountable problems
    preclude certification under Rule 23(b)(3). The
    Court is persuaded by the reasoning of these authori-
    ties: a determination that class certification is not a
    “reasonably foreseeable possibility” is not a post-
    removal change in jurisdictional facts, but rather is
    equivalent to a finding that jurisdiction never existed
    under CAFA in the first place. Accordingly, CAFA
    does not provide a basis for jurisdiction over this
    action.
    (Internal citations omitted).
    Having held that CAFA did not provide subject matter
    jurisdiction, the district court then rejected any other possible
    bases for jurisdiction, including supplemental jurisdiction and
    diversity jurisdiction. Finding no subject matter jurisdiction
    over this case, the district court remanded to Los Angeles
    Superior Court.5
    5
    After the district court remanded, plaintiffs’ Case Management State-
    ments in state court continued to assert that this case was a class action,
    indicated that class certification would be sought, and sought class discov-
    386                UNITED STEEL v. CONOCOPHILLIPS
    Plaintiffs timely petitioned for permission to appeal the
    June 2009 order denying class certification, and ConocoPhil-
    lips timely petitioned for permission to appeal the remand
    order. On September 30, 2009, this court granted both parties’
    petitions to appeal. We reverse and remand in plaintiffs’
    appeal of the order denying certification and dismiss as moot
    ConocoPhillips’ appeal of the order remanding this case to
    state court.6
    II
    [1] Federal Rule of Civil Procedure 23, which governs class
    certification, contains two distinct sets of requirements. Rule
    23(a) outlines four requirements, all of which must be met for
    class certification: (1) the class must be so numerous that join-
    der of all members is impracticable; (2) there must be ques-
    tions of law or fact common to the class; (3) the claims or
    defenses of the class representatives must be typical of the
    claims or defenses of the class; and (4) the class representa-
    ery. In response to plaintiffs’ filings, ConocoPhillips again removed to dis-
    trict court under CAFA. Plaintiffs filed a motion for remand, asserting that
    because the district court had held that class certification was not reason-
    ably possible, there could be no CAFA jurisdiction. The district court ulti-
    mately granted plaintiffs’ remand motion, holding that ConocoPhillips
    failed to present new facts or events sufficient to justify its second removal
    attempt.
    6
    CAFA imposes strict deadlines for the rendering of judgment by
    Courts of Appeals. Under 28 U.S.C. § 1453(c)(2), “[i]f the court of
    appeals accepts an appeal under paragraph (1), the court shall complete all
    action on such appeal, including rendering judgment, not later than 60
    days after the date on which such appeal was filed, unless an extension is
    granted under paragraph (3)” (emphasis added). Paragraph (3) provides
    that “[t]he court of appeals may grant an extension of the 60-day period
    described in paragraph (2) if — (A) all parties to the proceeding agree to
    such extension, for any period of time; or (B) such extension is for good
    cause shown and in the interests of justice, for a period not to exceed 10
    days.” 
    Id. § 1453(c)(3).
    Both parties graciously agreed to an extension in
    this case, and we grant an extension to the filing of this opinion.
    UNITED STEEL v. CONOCOPHILLIPS                387
    tives must fairly and adequately protect the interests of all
    members of the class. Fed. R. Civ. P. 23(a). The four require-
    ments of Rule 23(a) are commonly referred to as “numerosi-
    ty,” “commonality,” “typicality,” and “adequacy of
    representation” (or just “adequacy”), respectively. See, e.g.,
    Rodriguez v. Hayes, 
    578 F.3d 1032
    , 1047-51 (9th Cir. 2009).
    Where a putative class satisfies all four requirements of Rule
    23(a), it still must meet at least one of three additional
    requirements outlined in Rule 23(b) in order to be eligible for
    certification. Rule 23(b) provides that
    [a] class action may be maintained if Rule 23(a) is
    satisfied and if:
    (1) prosecuting separate actions by or against indi-
    vidual class members would create a risk of:
    (A) inconsistent or varying adjudications with
    respect to individual class members that would
    establish incompatible standards of conduct for the
    party opposing the class; or
    (B) adjudications with respect to individual class
    members that, as a practical matter, would be dispo-
    sitive of the interests of the other members not par-
    ties to the individual adjudications or would
    substantially impair or impede their ability to protect
    their interests;
    (2) the party opposing the class has acted or refused
    to act on grounds that apply generally to the class, so
    that final injunctive relief or corresponding declara-
    tory relief is appropriate respecting the class as a
    whole; or
    (3) the court finds that the questions of law or fact
    common to class members predominate over any
    questions affecting only individual members, and
    388                UNITED STEEL v. CONOCOPHILLIPS
    that a class action is superior to other available meth-
    ods for fairly and efficiently adjudicating the contro-
    versy. The matters pertinent to these findings
    include:
    (A) the class members’ interests in individually
    controlling the prosecution or defense of separate
    actions;
    (B) the extent and nature of any litigation concern-
    ing the controversy already begun by or against class
    members;
    (C) the desirability or undesirability of concentrat-
    ing the litigation of the claims in the particular
    forum; and
    (D) the likely difficulties in managing a class
    action.
    Fed. R. Civ. P. 23(b). The requirement outlined in Rule
    23(b)(3) is generally referred to as “predominance” and is the
    focus of plaintiffs’ appeal.7
    The party seeking class certification bears the burden of
    demonstrating that the requirements of Rules 23(a) and (b) are
    met. See Zinser v. Accufix Research Inst., Inc., 
    253 F.3d 1180
    ,
    1186 (9th Cir. 2001). Rule 23(b) states:
    A class action may be maintained if Rule 23(a) is
    satisfied and if . . . (3) the court finds that the ques-
    tions of law or fact common to class members pre-
    7
    The district court held that although plaintiffs had satisfied all four
    Rule 23(a) requirements, they did not establish an entitlement to certifica-
    tion under Rule 23(b)(2) or (3). Plaintiffs did not argue that they had satis-
    fied Rule 23(b)(1). On this appeal, plaintiffs have disavowed any reliance
    on Rule 23(b)(2) and argue only that the district court erred in holding that
    plaintiffs did not satisfy Rule 23(b)(3).
    UNITED STEEL v. CONOCOPHILLIPS                  389
    dominate over any questions affecting only
    individual members, and that a class action is supe-
    rior to other available methods for fairly and effi-
    ciently adjudicating the controversy. . . .
    We review both the ultimate decision whether to certify a
    class and the underlying determination whether the predomi-
    nance requirement of Rule 23(b)(3) has been satisfied for
    abuse of discretion. See 
    Zinser, 253 F.3d at 1186
    (class certi-
    fication generally), 1192 (predominance).
    In holding that Rule 23(b)(3) posed an “insurmountable
    barrier to class certification” in this case, the district court rea-
    soned:
    Defendant correctly points out that if Plaintiffs’ “on
    duty” theory of liability fails, then common ques-
    tions will no longer predominate over individual
    ones. In other words, if it is ultimately determined
    that (1) class members’ meal periods were not “on
    duty” or, alternatively, that (2) the conditions prereq-
    uisite to a lawful “on duty” meal period were satis-
    fied, then in order to establish Defendant’s liability,
    Plaintiffs will need to show that they actually missed
    meal breaks.
    The district court then stated that it appeared that “the exis-
    tence of a uniform policy as to the availability of a meal
    period could be proved on a classwide basis . . . .” However,
    in the district court’s view, “there c[ould] be no assurances
    that [plaintiffs] w[ould] prevail on [their ‘on duty’] theory.”
    And if plaintiffs did not prevail on this theory, the district
    court reasoned, the inquiry would then shift to whether plain-
    tiffs actually missed meal breaks, and “the Court w[ould] be
    faced with a case . . . requiring individualized trials on each
    class member’s meal period claims,” thus making “a class
    action . . . not . . . the superior method of resolving this suit.”
    390             UNITED STEEL v. CONOCOPHILLIPS
    As support for its conclusion that the possibility of numer-
    ous future mini-trials proved “an insurmountable barrier to
    class certification” under Rule 23(b)(3), the district court
    quoted an Eleventh Circuit decision, Andrews v. American
    Telephone & Telegraph Co., 
    95 F.3d 1014
    , 1023 (11th Cir.
    1996), which in turn quoted a decision by the Fourth Circuit,
    Windham v. American Brands, Inc., 
    565 F.2d 59
    , 70 (4th Cir.
    1977), stating: “[A] district court should not decline to certify
    a class because it fears that insurmountable problems may
    later appear. But where the court finds, on the basis of sub-
    stantial evidence as here, that there are serious problems now
    appearing, it should not certify the class merely on the assur-
    ance of counsel that some solution will be found.” (alteration
    in district court order).
    “We limit our [certification] review to whether the district
    court correctly selected and applied Rule 23’s criteria. An
    abuse of discretion occurs when the district court, in making
    a discretionary ruling, relies upon an improper factor, omits
    consideration of a factor entitled to substantial weight, or
    mulls the correct mix of factors but makes a clear error of
    judgment in assaying them.” Parra v. Bashas’, Inc., 
    536 F.3d 975
    , 977-78 (9th Cir. 2008) (internal quotation marks and
    citation omitted). Plaintiffs’ basic argument is that the district
    court abused its discretion by declining certification based on
    the possibility that plaintiffs would not prevail on the merits
    on their “on duty” theory. We agree.
    [2] Critically, the district court did not hold that plaintiffs’
    actual legal theory (what the district court referred to as
    “Plaintiffs’ ‘on duty’ theory of liability”) was one in which
    common issues of law or fact did not predominate over indi-
    vidual questions. Instead, the district court treated plaintiffs’
    actual legal theory as all but beside the point, holding that
    because “there can be no assurances that [plaintiffs] w[ould]
    prevail on this theory,” (emphasis added), the district court’s
    predominance inquiry would instead focus on the question
    whether plaintiffs “actually missed meal breaks,” an admit-
    UNITED STEEL v. CONOCOPHILLIPS                391
    tedly individualized inquiry. By refusing to analyze plaintiffs’
    “on duty” argument as the basis for its predominance inquiry
    because “there c[ould] be no assurances that they w[ould]
    prevail on this theory,” the district court ignored Ninth Circuit
    precedent and ultimately abused its discretion.
    [3] “In determining the propriety of a class action, the ques-
    tion is not whether the plaintiff or plaintiffs have stated a
    cause of action or will prevail on the merits, but rather
    whether the requirements of Rule 23 are met[,]” and “nothing
    in either the language or history of Rule 23 . . . gives a court
    any authority to conduct a preliminary inquiry into the merits
    of a suit in order to determine whether it may be maintained
    as a class action.” Eisen v. Carlisle & Jacquelin, 
    417 U.S. 156
    , 177-78 (1974) (quotation marks and citation omitted).
    Although certification inquiries such as commonality, typical-
    ity, and predominance might properly call for some substan-
    tive inquiry, “[t]he court may not go so far . . . as to judge the
    validity of these claims.” Staton v. Boeing Co., 
    327 F.3d 938
    ,
    954 (9th Cir. 2003). “[N]either the possibility that a plaintiff
    will be unable to prove his allegations, nor the possibility that
    the later course of the suit might unforeseeably prove the orig-
    inal decision to certify the class wrong, is a basis for declining
    to certify a class which apparently satisfies [Rule 23].” Blac-
    kie v. Barrack, 
    524 F.2d 891
    , 901 (9th Cir. 1975).
    [4] Here, the district court not only “judge[d] the validity”
    of plaintiffs’ “on duty” claims, it did so using a nearly insur-
    mountable standard, concluding that merely because it was
    not assured that plaintiffs would prevail on their primary legal
    theory, that theory was not the appropriate basis for the pre-
    dominance inquiry. But a court can never be assured that a
    plaintiff will prevail on a given legal theory prior to a disposi-
    tive ruling on the merits, and a full inquiry into the merits of
    a putative class’s legal claims is precisely what both the
    Supreme Court and we have cautioned is not appropriate for
    a Rule 23 certification inquiry. See 
    Eisen, 417 U.S. at 177-78
    ;
    Cummings v. Connell, 
    316 F.3d 886
    , 896 (9th Cir. 2003) (not-
    392              UNITED STEEL v. CONOCOPHILLIPS
    ing that “this circuit does not favor denial of class certification
    on the basis of speculative conflicts”); 
    Staton, 327 F.3d at 954
    ; Moore v. Hughes Helicopters, Inc., 
    708 F.2d 475
    , 480
    (9th Cir. 1983) (holding that “it is improper to advance a deci-
    sion on the merits to the class certification stage”).
    The only legal authority cited by the district court for its
    decision to ignore plaintiffs’ “on duty” legal theory in its pre-
    dominance analysis was the Eleventh Circuit’s decision in
    Andrews v. American Telephone & Telegraph Co., 
    95 F.3d 1014
    . We do not think Andrews bears the weight assigned it
    by the district court. In Andrews, a district court in Georgia
    certified two classes totaling several million members in liti-
    gation raising legal claims premised on the gaming laws of all
    fifty states and involving telephone calls to “hundreds of
    widely differing 900-number programs.” 
    Id. at 1023.
    The
    Eleventh Circuit held that the district court abused its discre-
    tion in certifying these classes due to the fact that the district
    court would have to “try millions of small claims,” 
    id., citing a
    Fourth Circuit case from 1977 for the proposition that
    “while the district court should not decline to certify a class
    because it fears that insurmountable problems may later
    appear, if the court finds that there are serious problems now
    appearing, it should not certify the class merely on the assur-
    ance that some solution will be found.” 
    Id. (internal quotation
    marks, ellipses, and citation omitted). Andrews is simply
    nothing like this case: in Andrews, the plaintiffs’ own legal
    theory required millions of mini-trials, a clear case of “serious
    problems now appearing,” while in this case the prospect of
    mini-trials would only appear if plaintiffs’ legal theory were
    actually rejected on its merits, a clear case of a “problem[
    that] may later appear.”
    [5] Moreover, a district court retains the flexibility to
    address problems with a certified class as they arise, including
    the ability to decertify. “Even after a certification order is
    entered, the judge remains free to modify it in the light of sub-
    sequent developments in the litigation.” Gen. Tel. Co. of the
    UNITED STEEL v. CONOCOPHILLIPS               393
    Sw. v. Falcon, 
    457 U.S. 147
    , 160 (1982); see also Rodriguez
    v. West Publ’g Corp., 
    563 F.3d 948
    , 966 (9th Cir. 2009) (“A
    district court may decertify a class at any time.”); 
    Cummings, 316 F.3d at 896
    (finding “the district court’s approach [to be]
    entirely appropriate” where the court determined that a poten-
    tial class “conflict was too speculative at the time [of the cer-
    tification motion] to prevent finding the named plaintiffs to be
    adequate representatives,” but “remained willing to reconsider
    and decertify the class if . . . there was evidence of an actual
    conflict”); Armstrong v. Davis, 
    275 F.3d 849
    , 871 n.28 (9th
    Cir. 2001) (“Federal Rule of Civil Procedure 23 provides dis-
    trict courts with broad discretion to determine whether a class
    should be certified, and to revisit that certification throughout
    the legal proceedings before the court.”). What a district court
    may not do is to assume, arguendo, that problems will arise,
    and decline to certify the class on the basis of a mere potenti-
    ality that may or may not be realized. If, on remand, the dis-
    trict court certifies the class and plaintiffs’ “on duty” legal
    theory is ultimately rejected, the district court can revisit its
    certification decision at that time. See 
    Cummings, 316 F.3d at 896
    .
    III
    [6] We remand to the district court for reconsideration of
    plaintiffs’ motion for class certification in light of our deci-
    sion. With respect to the proceedings on remand, we note that
    “[w]hile the court may not put the plaintiff[s] to preliminary
    proof of [their] claim[s], it does require sufficient information
    to form a reasonable judgment,” and “may request the parties
    to supplement the pleadings with sufficient material to allow
    an informed judgment on each of the Rule[ 23] requirements.”
    
    Blackie, 524 F.2d at 901
    n.17.
    Because we find the district court abused its discretion in
    its order denying certification, we need not address the issue
    raised by ConocoPhillips’ appeal.
    394           UNITED STEEL v. CONOCOPHILLIPS
    The judgment in No. 09-56578 is REVERSED; the appeal
    in No. 09-56579 is DISMISSED AS MOOT. The parties shall
    bear their own costs on appeal.