
639 F.3d 942 (2011)
Michael MARLO, an individual, Plaintiff-Appellee,
v.
UNITED PARCEL SERVICE, INC., a corporation, Defendant-Appellant.
Michael Marlo, an individual, Plaintiff-Appellant,
v.
United Parcel Service, Inc., a corporation, Defendant-Appellee.
Michael Marlo, an individual, Plaintiff-Appellee,
v.
United Parcel Service, Inc., a corporation, Defendant-Appellant.
Nos. 09-56196, 09-56206, 09-56451.
United States Court of Appeals, Ninth Circuit.
Argued and Submitted November 4, 2010.
Filed April 28, 2011.
*944 M. Kirby C. Wilcox and Paul W. Cane, Paul, Hastings, Janofsky and Walker, LLP, San Francisco, CA, George W. Abele, and Jennifer S. Baldocchi, Paul, Hastings, Janofsky and Walker, LLP, Los Angeles, CA, for the defendant-appellant.
John A. Furutani and Mark C. Peters, Furutani and Peters, LLP, Pasadena, CA, for the plaintiff-appellee.
Before: JOHNNIE B. RAWLINSON and MILAN D. SMITH, JR., Circuit Judges, and ROBERT C. JONES,[*] District Judge.

OPINION
M. SMITH, Circuit Judge:
Plaintiff-Appellee Michael Marlo and Defendant-Appellant United Parcel Service, Inc. (UPS) appeal or cross-appeal from a jury verdict awarding Marlo unpaid overtime, meal, and rest-period wages. UPS classified Marlo as an executive and administrative employee under California's Industrial Welfare Commission (IWC) Wage Order No. 9, Cal.Code Regs. tit. 8, § 11090 (2005), thereby purporting to exempt him from the California Labor Code's overtime-pay requirements. See Cal. Lab.Code § 515(a). The district court initially certified a class comprised of full-time supervisors employed by UPS from 2000 to 2004, and appointed Marlo class representative. In 2008, however, the court decertified the class on the ground that Marlo had failed to establish that common issues of law or fact predominated over individual ones. See Fed.R.Civ.P. 23(b)(3).
We have jurisdiction under 28 U.S.C. § 1291. We hold that the district court did not abuse its discretion in decertifying the class. We address the remaining issues in a memorandum disposition filed contemporaneously with this opinion.

FACTUAL AND PROCEDURAL BACKGROUND
From May 6, 1999, through November 12, 2008, Marlo worked for UPS as a hub supervisor, preload supervisor, and on-road supervisor (collectively, full-time supervisor or FTS). During that time, Marlo worked more than forty hours per week on a regular basis without taking meal or rest-period breaks, or receiving overtime compensation. As a hub supervisor, Marlo supervised hourly employees and part-time supervisors engaged in unloading, sorting, and loading packages. His duties included assigning employees tasks within their defined work areas, providing training to ensure safety and efficiency, monitoring employees' performance, and coordinating delivery times and volume. As a preload supervisor, Marlo supervised and trained hourly employees and part-time supervisors loading packages onto cars for delivery. As an on-road supervisor, Marlo supervised employees delivering packages.
*945 Marlo filed suit against UPS on May 6, 2003. On June 10, 2004, the district court certified a class under Federal Rule of Civil Procedure 23 and appointed Marlo class representative. In its class-certification order, the district court determined that Marlo "demonstrated that the job duties as set forth by UPS are similar with regard to the proposed class, and that UPS applies an overtime exemption policy to the proposed class based on their job titles." The district court concluded that a class action was a superior method for adjudicating the controversy because "Full Time Supervisors, especially those still employed at UPS, may fear reprisal, precluding them from filing individual actions[,]... and because of the large volume of individual actions that might proceed ... if the claims were adjudicated individually." The class consisted of FTS employed by UPS from 2000 to 2004.
The district court granted summary judgment in UPS's favor on August 22, 2005. Marlo appealed, and we reversed and remanded, concluding that "Marlo has raised material issues of fact related to whether the FTS `customarily and regularly exercise[ ] discretion and independent judgment.'" Marlo v. United Parcel Serv., Inc., 254 Fed.Appx. 568, 568 (9th Cir.2007) (citing Cal.Code Regs. tit. 8 § 11090(1)(A)(1)(d)).
On remand, the district court decertified the class. See Marlo v. United Parcel Serv., Inc., 251 F.R.D. 476 (C.D.Cal.2008). The court noted that its concern about the class-wide applicability of the evidence "has ripened into doubt regarding the continuing efficacy of a class action in this case." Id. at 480. Noting that "[a]s a general rule, this Court does not consider decertification necessary," id. at 488, it nonetheless concluded that Marlo had not established predominance, noting that the existence of a uniform policy classifying FTS as exempt is insufficient absent evidence of misclassification; id. at 484; that Marlo had relied heavily on a survey that was neither reliable nor representative of the class, id. at 485-86; and that his remaining evidence similarly was not representative of the class and did not address the "primarily engaged" element of the exemptions under IWC Wage Order No. 9, id. at 486-87. The court concluded:
Plaintiff's evidence is essentially individual testimony and an exemption policy. Under the circumstances in this case, where Plaintiff alleges that 1200 FTS have been misclassified as exempt employees, Plaintiff had to provide common evidence to support extrapolation from individual experiences to a class wide judgment that is not merely speculative. Plaintiff has not come forward with common proof sufficient to allow a fact-finder to make a class-wide judgment as to the FTS.
Id. at 486. Moreover, "[a]s the Court has found that individual issues predominate in this case, a class action is not the superior method for litigating this matter." Id. at 487. The court certified the issue for interlocutory appeal and stayed the action pending appeal. Id. at 488. We declined to hear the interlocutory appeal.
Following a nine-day trial and three days of deliberations, the jury returned a partial verdict for Marlo. The jury found, in relevant part, that during the period when Marlo was a hub supervisor, UPS had satisfied neither the executive nor administrative exemption in IWC Wage Order No. 9. The jury similarly found that during the period when Marlo was a preload supervisor, UPS had satisfied neither the executive nor administrative exemption. As to Marlo's work as an on-road supervisor, however, it found that UPS had satisfied each element of the executive exemption. It therefore awarded Marlo *946 unpaid overtime, meal, and rest-period wages for the times when he worked as a hub and preload supervisor.
Following trial, the district court denied UPS's motions for judgment as a matter of law and a new trial, and granted Marlo's motions for restitution and attorneys' fees. UPS timely appeals, and Marlo timely cross-appeals.

DISCUSSION
Marlo contends that the district court erred in determining that he failed to establish the "predominance" element of Rule 23(b)(3), and, as a result, decertifying the class. We review a district court's class-certification decision for an abuse of discretion. Yokoyama v. Midland Nat'l Life Ins. Co., 594 F.3d 1087, 1091 (9th Cir.2010). "If the district court's determination was premised on a legal error, we will find a per se abuse of discretion." Id. We hold that the district court did not err.
To maintain a class action, a plaintiff must demonstrate numerosity, commonality, typicality, and adequate representation of the class interest. Fed.R.Civ.P. 23(a). In addition to those requirements, Rule 23(b) provides that a class may be maintained, inter alia, if
the court finds that the questions of law or fact common to class members predominate over any questions affecting only individual members, and that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy. 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 concerning the controversy already begun by or against class members;
(C) the desirability or undesirability of concentrating 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)(3).
The district court determined that Marlo had failed to provide common proof that FTS class members were engaged in nonexempt work. IWC Wage Order No. 9, which regulates wages, hours, and working conditions in California's transportation industry, exempts from overtime-pay requirements "persons employed in administrative, executive, or professional capacities." Cal.Code Regs. tit. 8, § 11090(1)(A); see also Cal. Lab.Code § 515(a) ("The Industrial Welfare Commission may establish exemptions from the requirement that an overtime rate of compensation be paid ... for executive, administrative, and professional employees, provided that the employee is primarily engaged in the duties that meet the test of the exemption, customarily and regularly exercises discretion and independent judgment in performing those duties, and earns a monthly salary equivalent to no less than two times the state minimum wage for full-time employment."). As relevant here, the executive exemption applies to any employee:
(a) Whose duties and responsibilities involve the management of the enterprise in which he/she is employed or of a customarily recognized department or subdivision thereof; and
(b) Who customarily and regularly directs the work of two or more other employees therein; and
(c) Who has the authority to hire or fire other employees or whose suggestions and recommendations as to the hiring or firing and as to the advancement and promotion or any other change of status *947 of other employees will be given particular weight; and
(d) Who customarily and regularly exercises discretion and independent judgment; and
(e) Who is primarily engaged in duties which meet the test of the exemption.
Cal.Code Regs. tit. 8, § 11090(1)(A)(1)(a)-(e). The administrative exemption applies to any employee:
(a) Whose duties and responsibilities involve...:
(i) The performance of office or nonmanual work directly related to management policies or general business operations of his employer or his/her employer's customers;
... and ...
(b) Who customarily and regularly exercises discretion and independent judgment; and
(c) Who regularly and directly assists a proprietor, or an employee employed in a bona fide executive or administrative capacity ...; or
(d) Who performs under only general supervision work along specialized or technical lines requiring special training, experience, or knowledge; or
(e) Who executes under only general supervision special assignments and tasks; and
(f) Who is primarily engaged in duties that meet the test of the exemption.
Cal.Code Regs. tit. 8, § 11090(1)(A)(2)(a)(f).
As an initial matter, Marlo contends that the district court improperly shifted the burden to him in finding that he had failed to prove misclassification on a class-wide basis. That contention, however, conflates the burden borne by the employer concerning the merits with the burden borne by the employee concerning class certification. Under California law, an employer bears the burden of demonstrating that an employee is exempt from the Labor Code's overtime requirements. Nordquist v. McGraw-Hill Broad. Co., 32 Cal.App.4th 555, 38 Cal.Rptr.2d 221, 225-26 (1995). Accordingly, UPS would bear the burden of proving on the merits that Marlo or other class members were not misclassified as exempt under California law. However, Federal Rule of Civil Procedure Rule 23 governs the class-certification issue even if the underlying claim arises under state law. See Shady Grove Orthopedic Assocs., P.A., v. Allstate Ins. Co., ___ U.S. ___, 130 S.Ct. 1431, 1437, 176 L.Ed.2d 311 (2010) (stating that if Rule 23 answers the question in dispute, "it governs[state] law notwithstanding.... The question in dispute is whether [the plaintiff's] suit may proceed as a class action. Rule 23 provides an answer." (citations omitted)). Thus, as to the class-decertification issue, Marlo, as "[t]he party seeking class certification[,] bears the burden of demonstrating that the requirements of Rules 23(a) and (b) are met." United Steel Workers v. ConocoPhillips Co., 593 F.3d 802, 807 (9th Cir.2010).
The district court's order decertifying the class recognized that distinction. It evaluated whether "questions of law or fact common to class members predominate over any questions affecting only individual members, and [whether] a class action is superior to other available methods for fairly and efficiently adjudicating the controversy." Fed.R.Civ.P. 23(b)(3). The court concluded, "Because [Marlo] has brought a class action challenging UPS's exemption of FTS as a policy of misclassification, [he] must be `able to demonstrate pursuant to either scenario that misclassification was the rule rather than the exception....'" Marlo, 251 F.R.D. at 482 (citation omitted). The district court therefore properly placed the burden on *948 Marlo to demonstrate that Rule 23's classcertification requirements had been met.
Marlo also argues that the court abused its discretion in decertifying the class because he failed to establish the "predominance" element of Federal Rule of Civil Procedure 23(b)(3). In its order, the district court first noted changes that had occurred since its certification order, and concluded, "Plaintiff has not provided common proof to support a class-wide judgment as to liability.... As there is no common proof of misclassification in this case, there is no basis to adjudicate class-wide misclassification and the result is that individualized issues predominate over common ones." Marlo, 251 F.R.D. at 485. For the reasons explained infra, that conclusion was not an abuse of discretion.
Marlo contends that he satisfied his burden of establishing predominance by submitting evidence of UPS's centralized control, and uniform policies and procedures. But a blanket exemption policy "`does not eliminate the need to make a factual determination as to whether class members are actually performing similar duties.'" In re Wells Fargo Home Mortg. Overtime Pay Litig., 571 F.3d 953, 959 (9th Cir.2009) (citation omitted). Specifically, the existence of a policy classifying FTS as exempt from overtime-pay requirements does not necessarily establish that FTS were misclassified, because the policy may have accurately classified some employees and misclassified others.
To the extent Marlo argues that UPS's policies and procedures establish sufficient evidence of predominance, his argument still fails. Marlo asserts that the district court had before it various documents explaining activities that FTS are expected to perform, and procedures that FTS should follow in issuing staffing assignments and training hourly employees. Even assuming that those documents establish that UPS's policies and procedures apply to all FTS, however, Marlo has not explained how they establish predominance as to these particular exemptions. In particular, the fact that UPS expects FTS to follow certain procedures or perform certain tasks does not establish whether they actually are "primarily engaged" in exempt activities during the course of the workweek, Cal.Code Regs. tit. 8, § 11090(1)(A)(1)(e) & (2)(f), or whether they "customarily and regularly exercise[ ] discretion and independent judgment," id. § 11090(1)(A)(2)(b). Accord Donovan v. Burger King Corp., 675 F.2d 516, 521-22 (2d Cir.1982) (noting that the defendant's detailed policies and procedures did not foreclose the exercise of discretion by employees).
Nor, contrary to Marlo's assertion, did the district court err in requiring a week-by-week determination of exempt status. IWC Wage Order No. 9 states that in determining whether an employee is "primarily engaged" in exempt work, "[t]he work actually performed by the employee during the course of the workweek must, first and foremost, be examined and the amount of time the employee spends on such work ... shall be considered." Cal.Code Regs. tit. 8, § 11090(1)(A)(1)(e). California courts have construed this requirement to mean that "[u]nder California law, the Court must determine whether any given class members (or all the class members) spend more than 51% of their time on managerial tasks in any given workweek." Dunbar v. Albertson's, Inc., 141 Cal.App.4th 1422, 47 Cal.Rptr.3d 83, 86 (2006) (emphasis added). Therefore, the district court did not incorrectly apply California law by requiring a week-by-week showing of work the FTS actually performed.
Marlo's remaining evidence similarly does not support predominance. Marlo *949 relied, in part, on an annual employee survey conducted by UPS, but did not establish that UPS followed a reliable methodology in conducting the survey or that the survey was limited to FTS. Nor did he clarify whether respondents who self-identified as "supervisors" were necessarily FTS in the purported class. He also relied on a telephone survey of 160 FTS, and his counsel represented to the district court that the survey would provide common evidence, but the survey's designer stated in her deposition that she did not know whether the sample was representative. As the district court concluded, "Given its methodological and design problems, the [telephone] survey cannot qualify as common proof of misclassification because it is unrepresentative, unreliable, and has essentially no probative value." Marlo, 251 F.R.D. at 486. Moreover, "[t]he declarations and deposition testimony of FTS submitted by the parties suggest variations in job duties that appear to be a product of employees working at different facilities, under different managers, and with different customer bases." Id. Based on Marlo's evidence, the district court did not abuse its discretion in concluding that individual questions would predominate.
Marlo also argues that the district court abused its discretion in weighing the merits of the case. That contention mischaracterizes the district court's order. As the court noted, although it could not "weigh the evidence or otherwise evaluate the merits of a plaintiff's class claim," it could "compar[e] the class claims, the type of evidence necessary to support a class-wide finding on those claims, and the bearing of those considerations on Rule 23 certification." Id. at 481 n. 2. That is a correct statement of law. See Moore v. Hughes Helicopters, Inc., 708 F.2d 475, 480 (9th Cir.1983) (noting that although a decision on the merits is improper at the class-certification stage, some inquiry into the substance of a case may be necessary to determine whether commonality and typicality requirements are met).
The district court did not weigh the merits of the claim. It evaluated the surveys on which Marlo relied not to determine whether supervisors were exempt or non-exempt from overtime-pay requirements, but to determine whether the surveys could support a class-wide finding regarding certification. It evaluated Marlo's remaining evidence for the same purpose, noting that testimony by individual FTS similarly did not support a class-wide determination. In so doing, the court did not improperly weigh the merits of the claim. We hold that the district court did not abuse its discretion in decertifying the class.
Each party shall bear its own costs on appeal.
AFFIRMED.
NOTES
[*]  The Honorable Robert C. Jones, United States District Judge for the District of Nevada, sitting by designation.
