OPINION

BANKE, J. —

Eva Vidal Mies seeks to bring a class action against her former employer, Sephora U.S.A., Inc. (Sephora), on behalf of employees who, like her, worked as "Specialists" in Sephora's California retail stores. Mies claims Sephora misclassified Specialists as exempt from certain provisions of California labor law and, as a result, failed to pay overtime wages and failed to compensate them for missed meal periods. However, after crediting evidence that all Specialists do not engage in the same tasks to the same extent, the trial court denied class certification, concluding individualized issues, not common ones, would predominate the determination of liability. We conclude the trial court used proper legal criteria in assessing class certification and substantial evidence supports the trial court's findings. We therefore also conclude the court did not abuse its discretion in denying class certification.

FACTUAL AND PROCEDURAL BACKGROUND

Sephora operates 47 retail cosmetics stores in California. Each store has a "Store Director," who runs the store, and one to four Specialists. Specialists manage "Cast Members" (sales associates) and "Leads" (lead consultants, floor leads, or sales leads who take on greater responsibilities and who typically seek promotion to Specialist), and may manage between 10 and 45 subordinates at any given time.

In her February 27, 2012, complaint, Mies alleges Sephora has misclassified Specialists as exempt and paid them lower wages than required by law. She further alleges Sephora failed to pay overtime wages in violation of Labor Code section 1194, and engaged in unfair competition in violation of Business and Professions Code section 17200 by failing to pay these overtime wages, failing to provide Specialists with meal periods or compensating them for missed periods, improperly paying Specialists in accrued paid time off (PTO), and, as a result failing to provide accurate wage statements. Mies additionally seeks statutory penalties under the Labor Code Private Attorneys General Act of 2004 (Lab. Code, § 2698 et seq.).

Mies seeks to certify a class of the 99 California-based Specialists employed between February 22, 2006, and the present.1 The common issue, according to Mies, is "whether Sephora improperly classified the Specialists as exempt executives or administrators." She claims the proper classification of these Specialists can be determined by common proof, without a highly individualized inquiry for each employee.

In support of her class certification motion, Mies presented evidence she maintains shows the Specialist position is standardized, and thus amenable to class treatment.2 This included the fact there has been a single job description for Specialists since 1999. This description includes such activities as "directly manage a zone in terms of sales, operational and human resources functions," "ensure ... adherence to" corporate culture and policies, model client service standards, recruitment, supervision, and discipline of employees, ensure store presentations are appropriate, conduct inventories, "learn to perform cashier duties," move about the selling floor and offices, and "[a]ssume Store Director's responsibilities when assigned as Director-in Charge."

The job description also refers to companywide policies covering innumerable tasks to be performed in Sephora stores, whether completed by a Specialist or some other employee. Additionally, some tasks are assigned from above "store level" via e-mail or an electronic planning system, and Specialists review these communications and assure task completion. There is also a training program for all new Specialists, to ensure consistency in training. Specialists are evaluated in part on how well their store fares during audits for policy compliance.

In making her case for class certification, Mies also pointed to a 2010 in-house survey of how Sephora leadership (Store Directors, Specialists and Leads) spent nonselling time, which relied upon a single list of activities to analyze leadership time at all stores. The survey found leadership employees, collectively, generally spent the same percentage of time tackling nonselling tasks regardless of their store's sales volume.

Mies also asserted the trial court could look to statistical evidence to determine liability on a classwide basis. Mies did not propose or justify any particular statistical method of her own, however, and submitted no expert testimony. In her opening memorandum in the trial court, Mies simply stated "[g]iven we know the universe of tasks Sephora believes a Specialist can perform (based on its [2010] survey)," Mies "will present evidence through a statistical sample of the class, which will determine how much time Specialists spend on specified tasks" and "therefore establish, on a collective basis, whether [they] spend more than 50% of their time" doing nonexempt work. In her reply memorandum, Mies clarified she was not offering a statistical method of her own, but relying on Sephora's expert's deposition testimony, which she believed was evidence statistical sampling would give proof of classwide liability. She cited Sephora's expert's testimony about the usefulness of time and motion studies (essentially, employee monitoring) to ascertain what time a given employee spends on certain tasks. Moreover, the expert testified he had used such a study in connection with a class certification motion in a different case involving the question of employee classification. According to e-mails between Sephora and its expert, Sephora had considered conducting an observation study of 10 Specialists for its own purposes in this case, but apparently decided it was not then worth the cost.

Sephora opposed class certification with evidence the duties of Specialists varied. A Sephora district manager, Kelly Guerriero, declared company policies do not dictate everything a Specialist does, and Specialists "constantly have to use good judgment" to resolve situations with clients and with the employees they manage. She further stated the work of a Specialist varies with the size of the store, the number of Specialists employed at the store, the skills and experience of the Specialists, and the management style of the Store Director. Additionally, some stores have operation specialists and HR (human resources) specialists. In stores without such employees, Specialists also perform these functions. In stores with operation and HR specialists, regular Specialists "spend more time coaching, training and developing their subordinates" on the sales floor.

Sephora also submitted declarations by a substantial number of Specialists. One recounted the differences in tasks she performed while a Specialist at two San Francisco stores, one in the Stonestown mall (where she was the "right hand" of the Store Director) and a larger one on Powell Street (where she and other Specialists had more delineated roles). Another Specialist explained she ran a store for months while the position of Store Director was vacant.

Both Mies and Sephora submitted declarations from Specialists who estimated the time they spent performing various tasks. On the whole, Mies's declarants testified to spending most of their time selling to clients on the sales floor (activity Mies contends is not exempt from the labor laws). One Specialist stated she was selling 90 percent of her time and taking directions from the Store Director the remaining 10 percent and never "really engage[d] in any training" of employees. Another said she spent 75 percent of her time on the sales floor, while another said she spent 95 percent of her day in direct contact with clients.

Sephora's declarants related different experiences. For example, one said she spent 80 to 90 percent of her time on management tasks, including working as director in charge (in the Store Director's absence), preparing the store schedule, hiring, and human resources development, and only 10 to 20 percent of her time selling, an activity which was to be avoided. Another Specialist estimated spending 60 to 70 percent of her time on management and back office tasks, and 30 to 40 percent of her time on sales tasks. And another testified to spending 70 to 80 percent of her time on back office management and 20 to 30 percent on sales as a director in charge and coaching/training staff. Deposition testimony of a Sephora designee most knowledgeable about the duties of Specialists stated "in an ideal world" Specialists "would be out there [selling] all the time" but "it's not realistic" because of the job's "operational and people development ... responsibilities." The witness continued, the percentage of time selling "would range by store size and volume etc.... and so one expectation wouldn't even be realistic."

According to Sephora's district manager, it was common for Specialists to take charge of a store because, given the long retail hours, Store Directors were not always present. Sephora's Specialist declarants, likewise, reported spending differing amounts of time as "Director in Charge" (for example, between seven and 15 hours per week, or 10 and 16 hours per week, or 15 and 20 hours per week, or up to 25 hours during holidays). Many noted they exercised their independent judgment while Director in Charge, and also while eliminating applicants from hiring pools or recommending them, deciding what employee conduct to discipline, when to coach staff, or whether to bend rules for customers (e.g., regarding sales promotions).

Sephora also took issue with Mies's proposed statistical approach and provided a declaration from its expert stating sampling would not offer statistically useful evidence in the present case as to whether the class as a whole, or certain unobserved individuals in it, spent 50 percent of their time on exempt or nonexempt work. The expert also, at his deposition, commented on the list of tasks Sephora devised in connection with its 2010 survey of Leads, Specialists, and Store Directors, noting "a list of tasks doesn't really get you anywhere ... you really have to understand ... how time is allocated to those tasks, and that's the important question."

In ruling on the class certification motion, the trial court focused on whether common or individual issues would predominate. It found there would be some common issues, such as "how to define non-exempt v. exempt tasks, as well as the law that applies to those found to be working over 50% at non-exempt tasks." It also acknowledged the existence of companywide policies applicable to Specialists (and numerous other categories of Sephora employees) suggesting how Specialists might spend portions of their time, at least in theory. These policies governed, for example, how to work the selling floor (when to greet customers, what to wear, and how to price and arrange many of the products).

The court concluded, however, the "central issue for trial" would be "how the Specialists spend their time, not whether a given task" is exempt. It further concluded the generally applicable company policies, alone (which applied to Specialists and other employees alike), could not "at least in this case" provide a common basis for determining whether a given Specialist was exempt, because the Specialists' declarations — the trial court credited declarations submitted by Mies and Sephora equally — showed Specialists "handled their time very differently" in performing a wide variety of tasks.3 The declarations equally supported the propositions some Specialists spent more, and some Specialists spent less, than 50 percent of their time doing exempt work,4 and it was not clear to the trial court how it could determine, on a classwide basis, how the Specialists spent their time and whether they were collectively nonexempt or exempt. It found Mies's promise of statistical evidence to prove classwide liability insufficient, as she did not explain her proposal or how it could manage class issues. The court also believed use of statistical evidence to prove liability would violate Sephora's right to due process. Thus, the trial court was not persuaded common issues would predominate and denied certification.

DISCUSSION

Relevant Labor Law

(1) "California's Labor Code generally requires overtime pay for employees working more than 40 hours in a given workweek. (Lab. Code, § 510, subd. (a).)" (Dailey v. Sears, Roebuck & Co. (2013) 214 Cal.App.4th 974, 978 [154 Cal.Rptr.3d 480] (Dailey).) It also generally provides employees with meal periods and rest breaks. (Brinker, supra, 53 Cal.4th at p. 1018.) Certain employees, however, are exempt from these protections as a result of Labor Code provisions and regulations of the Industrial Wage Commission (IWC). (Dailey, supra, 214 Cal.App.4th at pp. 978-979; Brinker, supra, 53 Cal.4th at p. 1018; Lab. Code, §§ 515, subd. (a) [allowing exemption from overtime pay], 226.7, subd. (d) [allowing exemption from meal and rest periods].)

(2) IWC wage order No. 7-2001 governs mercantile5 employees, such as Specialists. (Cal. Code Regs., tit. 8, § 11070.) It implements the overtime and break requirements of the Labor Code for "nonexempt" employees and defines those "exempt" employees who are to be treated differently. Exempt individuals are "persons employed in administrative, executive, or professional capacities." (Cal. Code Regs., tit. 8, § 11070, subd. 1(A).)

Sephora maintains Specialists are exempt because they are employed in an executive or administrative capacity. Under IWC wage order No. 7-2001, a person "employed in an executive capacity means any employee" earning a certain minimum amount "(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 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[6] in duties which meet the test of the exemption. The activities constituting exempt work and non-exempt work shall be construed in the same manner as such items are construed in the following regulations under the Fair Labor Standards Act[7] effective as of the date of this order: 29 C.F.R. Sections 541.102,[8] 541.104-111, and 541.115-116.[9] Exempt work shall include, for example, all work that is directly and closely related to exempt work and work which is properly viewed as a means for carrying out exempt functions. The 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, together with the employer's realistic expectations and the realistic requirements of the job, shall be considered in determining whether the employee satisfies this requirement." (Cal. Code Regs., tit. 8, § 11070, subd. 1(A)(1).)

Similarly, a "person employed in an administrative capacity means any employee" earning a certain minimum amount whose duties involve "office or non-manual work directly related to management policies or general business operations of his/her employer or their employer's customer[]." (Cal. Code Regs., tit. 8, § 11070, subd. 1(A)(2)(a).) The employee also must be one "(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 (as such terms are defined for purposes of this section); 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. The activities constituting exempt work and non-exempt work shall be construed in the same manner as such terms are construed in the following regulations under the Fair Labor Standards Act effective as of the date of this order: 29 C.F.R. Sections 541.201-205, 541.207-208, 541.210, and 541.215.[10] Exempt work shall include, for example, all work that is directly and closely related to exempt work and work which is properly viewed as a means for carrying out exempt functions. The 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, together with the employer's realistic expectations and the realistic requirements of the job, shall be considered in determining whether the employee satisfies this requirement." (Cal. Code Regs., tit. 8, § 11070, subd. 1(A)(2).)

(3) Under both definitions, whether an employee is exempt depends not only upon factors related to the job, itself (e.g., "employer's realistic expectations" and "realistic requirements of the job"), but also "first and foremost" upon what an employee actually does on the job (e.g., "work actually performed"). (See Duran v. U.S. Bank National Assn. (2014) 59 Cal.4th 1, 27 [172 Cal.Rptr.3d 371, 325 P.3d 916] (Duran); Dailey, supra, 214 Cal.App.4th at p. 989 [classification issue requires proof of not only employer expectations but also "whether proposed class members in fact engage primarily in nonexempt activities"].) "No bright-line rule can be established classifying everyone with a particular job title as per se exempt or nonexempt...." (United Parcel Service Wage & Hour Cases (2010) 190 Cal.App.4th 1001, 1015 [118 Cal.Rptr.3d 834].) Thus, even though "[e]mployers often treat all workers within a job position as either exempt or nonexempt" in reality, "exemptions frequently depend on how individual employees perform their jobs." (Duran, supra, 59 Cal.4th at p. 25.)

Class Certification Considerations and Standard of Review

(5) "A class action may be maintained if there is `an ascertainable class and a well-defined community of interest among the class members.' [Citations.] As part of the community of interest requirement, the party seeking certification must show that issues of law or fact common to the class predominate." (Duran, supra, 59 Cal.4th at p. 28.) The "`ultimate question' for predominance is whether `the issues which may be jointly tried, when compared with those requiring separate adjudication, are so numerous or substantial that the maintenance of a class action would be advantageous to the judicial process and to the litigants.'" (Ibid.) The answer depends on whether liability under the class proponent's theory of recovery can be proved with facts common to all members of the class. "[C]lass treatment is not appropriate `if every member of the alleged class would be required to litigate numerous and substantial questions determining his individual right to recover following the "class judgment"' on common issues." (Ibid.)

(5) Because actions asserting misclassification will typically require an inquiry into a particular job type and into the work actually done by individuals within that job category, these actions often involve both common and individualized issues. The inquiry into a job's requirements and an employer's expectations likely involves common issues. (Duran, supra, 59 Cal.4th at p. 27 ["Job requirements and employer expectations of how duties are to be performed may often be established by evidence relating to a group as a whole."]; Sav-On Drug Stores, Inc. v. Superior Court (2004) 34 Cal.4th 319, 337 [17 Cal.Rptr.3d 906, 96 P.3d 194] (Sav-On) ["considerations such as `the employer's realistic expectations' ... and `the actual overall requirements of the job' ... are likely to prove susceptible of common proof" (citations omitted)].)

The inquiry into what work is actually done, however, can be heavily individualized. (See Duran, supra, 59 Cal.4th at p. 27 ["the outside salesperson exemption [to overtime pay] has the obvious potential to generate individual issues because the primary considerations are how and where the employee actually spends his or her workday"]; Sav-On, supra, 34 Cal.4th at pp. 336-337 ["Any dispute over `how the employee actually spends his or her time' [citation], of course, has the potential to generate individual issues."]; Soderstedt v. CBIZ Southern California, LLC (2011) 197 Cal.App.4th 133, 148 [127 Cal.Rptr.3d 394] (Soderstedt) ["evaluation of whether the elements of the administrative exemption have been established requires a fact-intensive inquiry, including an examination of the actual work performed by the employee"].)

When there are both common and individual issues, the question for the trial court is which sort of issues predominate. (Duran, supra, 59 Cal.4th at p. 28 ["The granting of class certification thus requires a determination that group, rather than individual, issues predominate."]; Sav-On, supra, 34 Cal.4th at pp. 336-337; see id. at pp. 333-334 ["Predominance is a comparative concept ..." and class actions are not inappropriate simply because there may be some individual issues "`at some point'" in determining a class member's eligibility for relief.].)

One distinction the Supreme Court has drawn with respect to an employer's defense of exempt classification is whether the defense merely raises questions about individuals' recovery ("questions about the calculation of damages generally do not defeat certification") or whether the defense hinges on the employer's liability and the determination of "factual questions specific to individual claimants," which can present a "greater challenge to manageability." (Duran, supra, 59 Cal.4th at p. 30 ["`Only in an extraordinary situation would a class action be justified where, subsequent to the class judgment, the members would be required to individually prove not only damages but also liability.'"].)

(6) Yet "individual issues will not necessarily overwhelm common issues when a case involves exemptions premised on how employees spend the workday." (Duran, supra, 59 Cal.4th at p. 31, citing Sav-On, supra, 34 Cal.4th at pp. 327-328.) In Sav-On, the Supreme Court upheld certification of an overtime class action based on a showing that all plaintiffs performed jobs that were highly standardized. As a result, class members performed essentially the same tasks, most of which were nonexempt as a matter of law. (Id. at pp. 327-328.) Further, the defendant's corporate policy required all class members to work overtime. (Id. at p. 327.) "Where standardized job duties or other policies result in employees uniformly spending most of their time on nonexempt work, class treatment may be appropriate even if the case involves an exemption that typically entails fact-specific individual inquiries." (Duran, supra, 59 Cal.4th at p. 31 [summarizing Sav-On].)

Whether to grant or deny class certification is a matter within a trial court's discretion. (Dunbar v. Albertson's, Inc. (2006) 141 Cal.App.4th 1422, 1430-1431 [47 Cal.Rptr.3d 83].) That said, "appellate review of orders denying class certification differs from ordinary appellate review. Under ordinary appellate review, we do not address the trial court's reasoning and consider only whether the result was correct. [Citation.] But when denying class certification, the trial court must state its reasons, and we must review those reasons for correctness. [Citation.] We may only consider the reasons stated by the trial court and must ignore any unexpressed reason that might support the ruling. [Citations.] [¶] We will affirm an order denying class certification if any of the trial court's stated reasons was valid and sufficient to justify the order, and it is supported by substantial evidence. [Citations.] We will reverse an order denying class certification if the trial court used improper criteria or made erroneous legal assumptions, even if substantial evidence supported the order. [Citations.] A trial court's decision that rests on an error of law is an abuse of discretion. [Citations.]" (Knapp v. AT&T Wireless Services, Inc. (2011) 195 Cal.App.4th 932, 939 [124 Cal.Rptr.3d 565].)

Given the Conflicting Evidence, the Trial Court Did Not Abuse Its Discretion in Denying Certification

(7) "Critically, if the parties' evidence is conflicting on the issue of whether common or individual questions predominate (as it often is ...), the trial court is permitted to credit one party's evidence over the other's in determining whether the requirements for class certification have been met...." (Dailey, supra, 214 Cal.App.4th at p. 991.)

(8) As the Supreme Court has noted, this deferential aspect of the standard of review means that when an employee has sought to certify a "misclassification" class of fellow employees with the same job title, the Courts of Appeal have "routinely upheld" trial court orders denying certification, while also upholding other trial court orders granting certification. (Duran, supra, 59 Cal.4th at p. 25.) Thus, in Sav-On, for instance, affirmance of class certification was appropriate after the trial court credited the plaintiffs' disputed evidence of (1) a deliberate corporate policy of misclassifying assistant and operating managers and (2) operational standardization causing those managers to be misclassified contrary to the employer's expectations. (Sav-On, supra, 34 Cal.4th at p. 329.) The court took pains to point out the trial court could have credited the employer's evidence of no intentional misclassification and evidence the "actual tasks performed by class members and the amount of time spent on those tasks var[ied] significantly from manager to manager...." (Id. at p. 331.) Had the trial court done so and reached the contrary conclusion — that individual instead of common issues predominated — denial of certification might have been affirmed on the very same evidentiary record. (Ibid.)11

The Court of Appeal in Dailey, supra, 214 Cal.App.4th at pages 991-992, applied the same deferential standard of review to affirm denial of certification. It saw "nothing inappropriate in the trial court's examination of the parties' substantially conflicting evidence of Sears's business policies and practices and the impact those policies and practices had on the proposed class members." (Id. at p. 991.) The trial court was well within its discretion "to have credited Sears's evidence indicating that highly individualized inquiries would dominate resolution of the key issues in this case." (Id. at pp. 991-992.) Further, the evidence — testimony of 21 proposed class members and six other personnel stating any uniform policies either did not exist or did not, as applied, uniformly result in proposed class members primarily performing nonexempt work — was substantial enough to support denial of certification. (Id. at pp. 992-997.) Dailey featured the same kind of divergent declarations in the record here: "in contrast to Dailey's witnesses, who state that Managers and Assistant Managers routinely spend 75 to 90 percent of their time performing typical nonexempt work, Sears's declarants aver they spend anywhere from 1 to 40 percent of their time on nonmanagerial, nonexempt tasks." (Id. at p. 995.)

Given the deference owed to the trial court (Sav-On, supra, 34 Cal.4th at p. 331; Dailey, supra, 214 Cal.App.4th at pp. 991, 997), we have no trouble concluding substantial evidence supports the trial court's finding that individual issues are likely to predominate and there was no abuse of discretion in denying class certification.

The trial court reasonably credited the declarations of Specialists from both sides, which, read together, suggest Specialists' exempt duties vary significantly from store to store and Specialist to Specialist, despite there being an understanding as to what tasks Specialists are likely to perform and despite Sephora having companywide operational policies. (Dailey, supra, 214 Cal.App.4th at p. 997 ["In light of [the] ... substantial evidence disputing the uniform application of its business policies and practices, and [the] showing [of] a wide variation in proposed class members' job duties, the trial court was acting within its discretion in finding that plaintiff's theory of ... liability was not susceptible of common proof at trial."]; see Walsh v. IKON Office Solutions, Inc. (2007) 148 Cal.App.4th 1440, 1458 [56 Cal.Rptr.3d 534] ["record suggests that the `dispute over "how the employee actually spends his or her time"' does `generate individual issues' which, in the trial court's estimation, rendered commonality so lacking as to destroy the justification for class ..."]; Dunbar v. Albertson's, Inc., supra, 141 Cal.App.4th at p. 1431 ["the significant variation in the grocery managers' work from store to store and week to week" required "very particularized individual liability determinations"].)

(9) Given the evidence before it, the trial court here could reasonably view the likely disputes at trial as being less about how to classify certain tasks (such as selling) and the impact of company policies, and more about how individual Specialists spend their time.12 "Wide variation among class members is a factor informing whether the exemption question can be resolved by a simple `yes' or `no' answer for the entire class."13 (Duran, supra, 59 Cal.4th at p. 32.)

Mies claims the trial court did not consider her theory that, to be exempt, a Specialist must "customarily and regularly exercise[] discretion and independent judgment." (See Cal. Code Regs., tit. 8, § 11070, subd. 1(A)(1)-(2).) She then faults the court for not evaluating whether every Specialist uniformly could not, and did not, perform exempt work requiring such independence, because Sephora's detailed policies governed all aspects of store operations and curtailed all Specialists' independence.

(10) However, the trial court did recognize there would likely be common questions about whether a given task involved sufficient discretion or independent judgment to be exempt. Nevertheless, it viewed "how Specialists spend their time" as being the more "central" issue for trial. Resolution of this issue, the court concluded, would likely turn less on Sephora's general operational policies, and more on evidence, as in the Specialists' declarations, pertaining to the nature of each individual's actual work. The court also acknowledged the policies' detailed nature, but reasonably found such operational minutia offered little insight into classwide liability, especially in light of the declarations showing Specialists handled their time very differently, varying as to the nature and level of the tasks and the time spent on those tasks. In the end, the trial court weighed the foreseeable common and individual issues, and reasonably concluded the Specialists' proper classification would likely hinge on individualized proof. This sort of balancing analysis was appropriate. (See Sav-On, supra, 34 Cal.4th at p. 334 ["Predominance is a comparative concept...."].)

(11) Moreover, the mere fact Sephora has common policies applicable to all employees, including Specialists, cannot, alone, compel class certification. (Duran, supra, 59 Cal.4th at p. 29 [even when the party proposing a class asserts "the employer consistently imposed a uniform policy or de facto practice on class members, the party must still demonstrate that the illegal effects of this conduct can be proven efficiently and manageably within a class setting"]; Koval v. Pacific Bell Telephone Co. (2014) 232 Cal.App.4th 1050, 1060 [181 Cal.Rptr.3d 805] ["existence of a uniform policy does not limit a trial court's inquiry into whether class action treatment is appropriate..."]; Dailey, supra, 214 Cal.App.4th at p. 989; see Arenas v. El Torito Restaurants, Inc. (2010) 183 Cal.App.4th 723, 734 [108 Cal.Rptr.3d 15] (Arenas) ["[t]he trial court concluded plaintiffs' theory of recovery — that managers, based solely on their job descriptions, were as a rule misclassified — was not amenable to common proof' given evidence employees'" duties and time spent on individual tasks varied widely ..."].) To the contrary, "courts have routinely concluded that an individualized inquiry is necessary even where the alleged misclassification involves application of a uniform policy...." (Soderstedt, supra, 197 Cal.App.4th at p. 153.)

Mies would have us, from Sephora's detailed policies, draw inferences about what every Specialist actually does and how much independence every Specialist actually exercises, while essentially ignoring the declarations from both sides, which the trial court credited on those very subjects — declarations that indicate a lack of classwide uniformity.14 Mies's request, then, is one to reweigh the evidence on appeal, something we cannot do. (Dailey, supra, 214 Cal.App.4th at p. 991; Sav-On, supra, 34 Cal.4th at p. 338 ["... Court of Appeal erred to the extent it engaged in any reweighing of ... evidence."].)15

Mies further asserts the trial court, in denying certification, "used improper criteria or made erroneous legal assumptions" that require reversal. (See Knapp v. AT&T Wireless Services, Inc., supra, 195 Cal.App.4th at p. 939.) She claims, for example, "the trial court in this case ignored" that a class proponent need not show misclassification (that is, liability) will or will not be found as to every class member. (See Sav-On, supra, 34 Cal.4th at p. 338 [not a prerequisite to class certification to prove a classification policy was "`right as to all members of the class or wrong as to all members of the class'"].) But the trial court did not "ignore" this premise, nor did it apply a contrary premise. It did not, for instance, insist that Mies prove all Specialists are in fact misclassified. Rather, it concluded, consistent with the case law we have discussed, certification would be proper if common issues predominated but concluded they did not, given the evidence as to the varying ways Specialists actually spend their time.

Mies also claims the trial court erroneously reviewed the evidence for success on the merits, and not merely for commonality or individuality of class members' issues. (See Jaimez v. Daiohs USA, Inc. (2010) 181 Cal.App.4th 1286, 1300 [105 Cal.Rptr.3d 443] (Jaimez) ["The determination of whether to certify a class does not contemplate an evaluation of the merits."].)16 The trial court did not resolve the merits of this case. Rather, as discussed, it carefully considered whether common issues or individual issues would likely predominate, concluding that how Specialists actually spend their time would be not only the key issue, but an issue not suited to classwide treatment, given the conflicting declarations on the subject and lack of a viable plan for statistical evidence.17

(12) Finally, the trial court did not err in rejecting Mies's proposal to use statistical evidence to prove liability with respect to absent class members. Mies's proposal was undeveloped and unsubstantiated, and the court was not required to accept her unjustified assurances regarding what she could prove, especially given the declaration of Sephora's expert stating the use of sampling to determine liability with respect to absent class members would not work. (Duran, supra, 59 Cal.4th at p. 31 ["a statistical plan for managing individual issues must be conducted with sufficient rigor"]; Dailey, supra, 214 Cal.App.4th at p. 998 ["a mere proposal for statistical sampling" not "an adequate evidentiary substitute for demonstrating the requisite commonality" (italics omitted)]; cf. Mora v. Big Lots Stores, Inc. (2011) 194 Cal.App.4th 496, 510 [124 Cal.Rptr.3d 535] ["Dr. Hoffman had not yet conducted a survey and his declaration describing the proper method for designing and implementing a scientific survey did nothing to refute the evidence presented by Big Lots that it did not operate its stores or supervise its managers in a uniform and standardized manner."].)18

DISPOSITION

The order denying class certification is affirmed.

Margulies, Acting P. J., and Dondero, J., concurred.