*777 The opinion was delivered by
Plaintiffs Audie Dragon and John Howard are Georgia residents who filed suit on behalf of themselves and a nationwide class of property owners whose property contains polybutylene pipe manufactured from Mitsui resin. Plaintiffs allege this defective product, known as M pipe, was designed, manufactured, advertised, or sold by defendants.
The district court granted plaintiffs’ motion for nationwide class certification and defined the class as: “All persons and entities that own real property or structures and/or improvements to real property in the United States in which there was installed between Januaiy 1,1990, and the present Vanguard polybutylene plumbing containing resin manufactured by Mitsui Plastics, Inc.” After denying a motion for reconsideration, the trial court amended its prior order to include the findings required before a request for interlocutory appeal may be made. See K.S.A. 60-2102(b). The Court of Appeals granted the defendants’ application for permission to take an interlocutory appeal. This court denied plaintiffs’ petition for review of that decision and transferred the appeal to this court on the court’s own motion pursuant to K.S.A. 20-3018(c).
The defendants allege that the district court abused its discretion in finding that the prerequisites established by K.S.A. 2003 Supp. 60-223 were satisfied. More specifically, defendants allege that the trial court erred in not fully considering disputes regarding facts relevant to the statutory prerequisites and choice-of-law problems. The defendants also allege that the district court erred in relying on non-Kansas cases where other courts had certified class actions in which plaintiffs sought damages from manufacturers of defective polybutylene pipe made with a resin other than the Mitsui resin which is alleged to be a component of the defective product at issue in this case.
We find that the trial court failed to fully determine factual issues relating to the prerequisites for class certification and to rigorously analyze the requirements of commonality, typicality, predominance, and superiority. We reverse and remand for further proceedings on the issue of whether the requested class should be certified.
*778
K.S.A. 2003 Supp. 60-223 governs class actions. This provision is patterned after Fed. R. Civ. Proc. 23, although it is not identical, and this court has traditionally followed the federal courts’ interpretation of the federal rule.
Steele v. Security Benefit Life Ins. Co.,
The federal rule was amended in 2003, and its Kansas counterpart in 2004, while this case was on appeal. The amendments to K.S.A. 2003 Supp. 60-223 are not yet effective (2004 House Bill No. 2764); therefore, the pre-amendment version of tire statute governs this analysis.
K.S.A, 2003 Supp. 60-223(a), like its federal counterpart, imposes four requirements applicable to all class actions:
“(a) Prerequisites to a class action. One or more members of a class may sue or be sued as representative parties on behalf of all only if (1) the class is so numerous that joinder of all members is impracticable, (2) there are questions of law or fact common to the class, (3) the claims or defenses of the representative parties are typical of the claims or defenses of the class, and (4) the representative parties will fairly and adequately protect the interests of the class.” K.S.A. 2003 Supp. 60-223(a).
In abbreviated form, these threshold elements require: (1) numerosity, (2) commonality, (3) typicality, and (4) adequacy of representation.
In addition to satisfying these four prerequisites, parties seeking class certification must show that the action is maintainable under K.S.A. 2003 Supp. 60-223(b)(l), (2), or (3). Plaintiffs in this case seek certification under K.S.A. 2003 Supp. 60-223(b)(3). This provision adds two additional prerequisites: common questions of law or fact must “predominate over any questions affecting only individual members” and class resolution must be “superior to other available methods for tire fair and efficient adjudication of the controversy.” K.S.A. 2003 Supp. 60-223(b)(3) includes a list of factors pertinent to a court’s examination of the predominance and superiority requirements:
“(A) The interest of members of tire class in prosecuting or defending separate actions; (B) the extent and nature of any litigation concerning the controversy already begun by or against members of the class; (C) the appropriate place for *779 maintaining, and the procedural measures which may be needed in conducting, a class action.” K.S.A. 2003 Supp. 60-223(b)(3).
The trial court made specific findings that each of the prerequisites of K.S.A. 2003 Supp. 60-223(a) and (b)(3) had been met. Regarding the four prerequisites of K.S.A. 2003 Supp. 60-223(a), defendants focus upon the trial court’s findings that commonality and typicality were met. Defendants also challenge tire trial court’s findings that the prerequisites of K.S.A. 2003 Supp. 60-223(b)(3), predominance and superiority, were met. Many of the prerequisites overlap, as do defendants’ arguments. Intertwined with all of the defendants’ arguments is the contention that the trial court erred in failing to fully consider and resolve factual questions regarding class issues before the court certified the class.
Standard of Review
“Trial judges are afforded substantial discretion in determining whether a class should be certified.”
Bigs v. City of Wichita,
*780
Applying these principles in the context of the discretionary decision to certify a class, the United States Supreme Court has explained “this discretion is not unlimited, and indeed is bounded by the relevant provisions of the . . . Rules.”
Gulf Oil Co. v. Bernard,
While the trial court has substantial discretion in determining whether a class should be certified, the provisions of K.S.A. 2003 Supp. 60-223 must be applied and rigorously analyzed.
Did the Trial Court Abuse its Discretion by Not Weighing Evidence?
The defendants argue that the trial court abused its discretion by not resolving factual issues which defendants placed in dispute by filing affidavits and portions of the plaintiffs’ depositions. This evidence related to the number of states where the product was sold, difficulties in identifying the product, and variances in the factors contributing to product failure.
The plaintiffs contend the trial court should make the certification decision solely on the basis of the allegations contained in the pleadings. In support of this argument plaintiffs cite
Eisen v. Carlisle
&
Jacquelin,
This argument has been rejected by federal courts. In
Falcon,
the United States Supreme Court explained that in order to rigorously analyze the Rule 23 prerequisites “it may be necessary for the court to probe behind the pleadings before coming to rest on the certification question.”
Falcon,
Plaintiffs argue against the federal view and suggest that Kansas law does not allow the consideration of evidence on a preliminary, procedural motion.
*782
First, plaintiffs note that K.S.A. 2003 Supp. 60-223(c)(l) requires the trial court to consider class certification “[a]s soon as practicable after the commencement and before the decision on the merits.” The same language was used in Fed. R. Civ. Proc. 23 before the rule was amended in 2003 and has been interpreted not to “mandate precipitous action. The court should defer decision on certification pending discovery if the existing record is inadequate for resolving the relevant issues.”
Chateau de Ville Productions, Inc. v. Tams-Witmark Music Library, Inc.,
We find no reason to apply a different analysis to the Kansas statute. The trial court should make the certification decision as soon as practicable after the parties have had an opportunity to develop and present the facts relevant to class certification.
Next, plaintiffs urge us to treat a motion for class certification in a manner akin to a motion under K.S.A. 60-212, restricting the determination to allegations in the pleadings, as compared to K.S.A. 2003 Supp. 60-256, which allows evidence to be considered. The Seventh Circuit Court of Appeals rejected this same argument, noting:
“The reason why judges accept a complaint’s factual allegations when ruling on motions to dismiss under Rule 12(b)(6) is that a motion to dismiss tests the legal sufficiency of a pleading. Its factual sufficiency will be tested later — by a motion for summary judgment under Rule 56, and if necessary by trial. By contrast, an order certifying a class usually is the district judge’s last word on the subject; there *783 is no later test of the decision’s factual premise (and, if the case is settled, there could not be such an examination even if the district judge viewed the certification as provisional). Before deciding whether to allow a case to proceed as a class action, therefore, a judge should make whatever factual and legal inquiries are necessary under Rule 23.” Szabo v. Bridgeport Machines, Inc.,249 F.3d 672 , 675-76, cert. denied534 U.S. 951 (7th Cir. 2001).
The
Szabo
court gave an example of one party alleging that the class had 10,000 members, making it too numerous to allow joinder, while the other party insisted that the class contained only 10 members. The court’s conclusion, with which we agree, was that “[a] judge would not and could not accept the plaintiff s assertion as conclusive; instead the judge would receive evidence (if only by affidavit) and resolve the disputes before deciding whether to certify the class.”
In addition, plaintiffs’ argument ignores K.S.A. 2003 Supp. 60-243(d), which provides: “When a motion is based on facts not appearing of record the court may hear the matter on affidavits presented by the respective parties, but the court may direct that the matter be heard wholly or partly on oral testimony or depositions.” Federal courts have recognized that the comparable federal rule, Fed. R. Civ. Proc. 43(e), serves as the basis for considering evidence on a motion to certify a class in federal court. 3 Newberg § 7:26, p. 82 n.6; 9 Wright and Miller, Federal Practice and Procedure: Civil 2d § 2416 (1995).
Therefore, we reject plaintiffs’ arguments and find that a trial court must give careful consideration to and conduct a rigorous analysis of the prerequisites imposed by K.S.A. 2003 Supp. 60-223 and, in doing so, should consider evidence when submitted by the parties and make those factual determinations necessary to a determination of whether the prerequisites for a class action are met.
Did the Trial Court Err in Not Considering Choice-of-Law Issues?
As an alternative argument, plaintiffs suggest that the trial court considered the evidence submitted by the defendants. The plaintiffs point out that, although the trial court did not specifically reference the affidavits or discovery record, the trial court indicated it had considered “Plaintiff s motion and brief for class cer *784 tífícatíon, Defendants’ response brief, Plaintiffs’ reply brief, . . . the file and . . . oral argument.”
However, as defendants note, the trial court did not resolve those facts which were relevant to class certification and which were disputed. Many of defendants’ arguments focus upon one disputed and unresolved fact, the number of states in which class members may reside. In briefs, plaintiffs indicate that members of the class reside in less than a dozen states. In response, the defendants submitted an affidavit which stated that the pipe was “potentially shipped to customers in most of the states of the United States.”
The trial court did not resolve this factual issue and did not consider the related legal issues, finding it was premature to determine whether Kansas law would govern the entire class or whether other states’ laws might be applicable. Defendants argue that without consideration of the choice-of-law factor there is no basis for the trial court to determine commonality, typicality, predominance, or superiority. For example, defendants question how, without having examined the choice-of-law problem, the trial court could conclude: “There are numerous questions of law that are common to the class, as the jury instructions would be essentially the same for every class member on the issue of liability if this case were tried repeatedly and would be the same on damages.”
The defendants’ arguments are premised on their view that the court must apply the laws of the various states in which plaintiffs reside, which defendants contend could involve most states. The defendants note that for claims regarding contract issues, in the absence of a contractual provision stating a choice-of-law agreement K.S.A. 2003 Supp. 84-1-105(1), Kansas courts have traditionally applied the rule of
lex loci contractus. In
most instances, this means courts apply the substantive law of the state where the contract was made, although in some instances the courts look to the place of performance. See
Wilkinson v. Shoney’s, Inc.,
*785
Additionally, the defendants argue that Kansas courts have traditionally applied the rule of
lex loci delicti
to tort claims. Under that rule, courts apply the substantive law of the state where the wrong occurs, meaning the place where the injury was sustained. See
Ling v. Jan's Liquors,
Defendants argue that class prerequisites cannot be satisfied in nationwide product liability cases where the rule of
lex loci delicti
governs choice-of-law determinations. One example of a mass tort class action filed in a
lex loci delicti
state is
In re Bridgestone/Firestone, Inc.,
The Seventh Circuit Court of Appeals disagreed, holding that because Indiana is a
lex loci delicti
state, it would apply the law of the place where the harm occurred. The plaintiffs suffered financial losses in the places where they purchased or leased their vehicles or tires; therefore, the laws of the states where the SUV buyers and lessees resided would apply to the breach of warranty and consumer fraud claims that were asserted.
Defendants contend that because Kansas, like Indiana, is a lex loci delicti state, our choice-of-law rules dictate that the law of the state where each plaintiff resides, that is, where each plaintiff suffered the financial injury of owning a home containing defective *786 polybutylene pipe, would apply to that plaintiffs claim, and application of this rule would make a class action inappropriate.
As previously noted, the trial court determined it was pi-emature to consider these issues and did not consider whether the law of the states of plaintiffs’ residences would apply and, if so, what variances would exist in the laws.
This approach is contrary to this court’s prior direction to trial courts considering class certification. In
Shutts Executor v. Phillips Petroleum Co.,
“We hasten to add, this opinion should not be read as an invitation to file nationwide class action suits in Kansas and overburden our court system. Concepts of manageability in terms of our Kansas class action statute, the nature of the controversy and the relief sought, die interest of Kansas in having the matter determined, and the class size and complexity will have to be applied. [Citation omitted.] A court should also give careful consideration, as roe have attempted to do, to any possible conflict of law problems. When liability is to be determined according to varying and inconsistent state laws, the common question of law or fact prerequisite of KS.A. 60-223(a)(2) will not be fulfilled.” (Emphasis added.)222 Kan. at 557 .
While in
Shutts I,
we addressed the issue of commonality, choice-of-law considerations are important to the predominance and superiority factors as well. As noted by the Fifth Circuit Court of Appeals in reversing the class certification of a national class of smokers who alleged eight state law causes of action, “[I]n a multistate class action, variations in state law may swamp any common issues and defeat predominance. . . . Accordingly, a district court must consider how variations in state law affect predominance and superiority.”
Costano, 84 F.3d
at 741. Other cases are in accord. See,
e.g., Spence v. Glock,
Plaintiffs present several arguments as to why the trial court could certify a class in this case without analyzing the impact of the choice-of-law issue. First, plaintiffs note that the class certification is subject to modification. While this is true, the provisional nature of class certification does not lessen the movant’s burden of establishing that the prerequisites for certification are met. See
Falcon,
Additionally, plaintiffs cite to the trial court’s reliance on Kansas’ long history of certifying class actions. The trial court cited
Shutts I,
Nothing in these decisions deviates from the statement in
Shutts I
cautioning a trial court to consider “any possible conflict of law problems” because class prerequisites could be defeated when liability is to be determined according to varying and inconsistent state laws.
Furthermore, the Kansas cases cited by the trial court and the plaintiff are factually distinguishable from the case at bar. Each of those cases involved oil and gas leases where the dispute raised relatively few legal issues as compared to the numerous issues raised in this products liability case where plaintiffs’ theories of liability include: breach of express .and implied contract (plaintiffs as third-party beneficiaries); negligent misrepresentation; strict liability under K.S.A. 60-3301 etseq.; strict advertising liability under § 402B of the Restatement (Second) of Torts (1964); deceptive and unconscionable acts under the Kansas Consumer Protection Act; breach of the implied warranty of merchantability and fitness for a particular purpose under the Uniform Commercial Code; res ipsa loquitur and negligence; and equitable theories of quantum meruit and unjust enrichment.
Despite the number of these theories, plaintiffs contend the fundamental theories of law which will be presented to the
jury in
this
case
are essentially the same in all states. Plaintiffs claim that the Uniform Commercial Code is followed by virtually every state as is the product liability law established in the Restatement (Second) of Torts § 402A (1964). Plaintiffs also contend consumer protection laws are essentially the same from state to state, citing as an example
Hanlon v. Chrysler Corp.,
Plaintiffs’ argument regarding the Restatement is belied by the Reporter’s Notes to § 402A which show that not every state has adopted the rule contained in that section. Regarding the claims of breach of warranties made under the Uniform Commercial Code, while the nationwide adoption of the uniform code provides this cause of action in virtually all states, it is not applied in the same fashion everywhere, especially concerning whether vertical privity is a prerequisite to recovery.
Osborne v. Subaru of America, Inc.,
“The law of negligence, including subsidiary concepts such as duty of care, foreseeability, and proximate cause, may . . . differ among the states only in nuance, though we think not .... But nuance can be important, and its significance is suggested by a comparison of differing state pattern instructions on negligence and differing judicial formulations of the meaning of negligence and the subordinate concepts.” Matter of Rhone-Poulenc Rorer Inc.,51 F.3d 1293 , 1300 (7th Cir. 1995).
Furthermore, there is wide variance in the laws of various states regarding other aspects of products liability theories and various affirmative defenses thereto.
Castano,
Our prior cases regarding class actions are also distinguishable because of the potential number of states whose laws may impact this case. None of the Kansas cases cited by the plaintiffs or relied upon by the trial court involved application of the laws of more than six states. In this case the record does not disclose the number of states involved. However, the affidavit presented by defendants indicates that the laws of most of the 50 states might be implicated.
Plaintiffs argue that the number of states potentially involved is not relevant because many states have applied the law of the forum in nationwide products liability cases. Citing the Restatement (Sec
*790
ond) of Conflicts of Laws (1971) “most significant relationship test” and the numerous class action cases to apply that test, plaintiffs argue that, at most, the laws of Kansas and South Carolina should be applied since these are the only states where the product was manufactured. However, defendants note that this court has yet to decide choice-of-law principles in certain kinds of mass tort cases, including class actions. See Bezek,
Conflict of Laws in Kansas: A Guide to Navigating the Dismal Swamp,
71 J.K.B.A. 21, 24 (Sept. 2002) (“[C]lass action tort cases pose substantial problems when the class members are from different states. The likely course the Kansas appellate courts would take in such a case is not established.”) Bezek’s article also points out that in some cases, Kansas courts have opted to apply Kansas law absent a clear showing that another state’s law should apply. See
Systems Design v. Kansas City P.O. Employees Cred. Union,
However, the record before us does not allow determination of these issues. Various factors are relevant to a choice-of-law determination, including the procedural or substantive nature of the question involved, the residence of the parties involved, and the interest of the state in having its law applied.
Sun Oil Co. v. Wortman,
*791 Because these issues were not developed in the record before us and were not analyzed by the trial court, we cannot determine the validity of plaintiffs’ argument or determine which state’s or states’ laws apply in this case.
Plaintiffs suggest that it would be inappropriate for us to remand the case for consideration of the choice-of-law issue because the defendants had the burden to establish that the law of other states would apply, they failed to do so, and have forfeited their right to complain. In support of this argument, plaintiffs cite
Layne Christensen Co. v. Zurich Canada,
Within the context of a motion for class certification, many other courts disagree and have determined that the person seeking the class must meet the burden of establishing that conflicts in applicable laws do not defeat the requirements of commonality, typicality, predominance, and superiority. As one commentator stated: “[I]t is incumbent upon class counsel to prove to the court that the multistate class should proceed. Class counsel must either show that there are no significant differences in the various state laws, or, if there are variations, that they can be managed by the trial court.” 4 Newberg on Class Actions § 13:36, p. 436-37. See,
e.g., Walsh v. Ford Motor Co.,
We find this latter analysis to be more persuasive and conclude that when the determination is whether the prerequisites of K.S.A. 2003 Supp. 60-223 are met, the movant has the burden to show that there are no significant differences in the various states’ law or, if there are variations, that they can be managed by the trial court.
Plaintiffs also argue that remand is unnecessary because the trial court recognized that subclasses may need to be created based upon the variations in state law. Plaintiffs assert that any conflict problem can be managed through these subclasses. In one of the first cases to recognize the use of subclasses as a mechanism for dealing with conflict-of-law issues, the Illinois Supreme Court noted that subclasses do not necessarily cure the problems raised when different laws must be applied. The court stated that the predominance of common questions of law or fact depended “upon plaintiff s ability to establish that the differing laws of the States are subject to grouping in a
manageable
number of subclasses.” (Emphasis added.)
Miner v. Gillette,
We conclude, therefore, that the matter should be remanded for consideration of the choice-of-law issue and the impact upon the prerequisites imposed by K.S.A. 2003 Supp. 60-223.
Other Issues
Defendants argue that the trial court erred in disregarding the factual variances in causation, damages, and other aspects of each *793 individual claim. Defendants note that even between the two plaintiffs there is variance in the type of plumbing failures experienced; one involved leaks inside the house and the other involved leaks outside the house. Defendants also provided an affidavit from Vanguard Plastics’ Director of Quality Assurance stating that the causes of polybutylene plumbing system failures can be multiple and may include improper installation practices, improper maintenance and design of the system, and exposure to excessive chlorination. An affidavit from another Vanguard employee described the difficulty of identifying homes with Mitsui pipe.
It is unclear how the trial court treated these aspects of the affidavits regarding individual questions which might be at issue. We note that the presence of individual questions, while tending to diminish the weight of class facts, does not necessarily defeat a prima facie showing that the class prerequisites are satisfied, 3 Newberg § 7:26, or mean that there has been an abuse of discretion in certifying the class,
Helmly v. Ashland Oil, Inc.,
However, the weight to be given these facts is also somewhat dependent on the various choice-of-law issues. Therefore, on remand these facts will again need to be analyzed, especially in relation to the superiority and predominance factors.
Finally, for purposes of providing guidance on remand, we consider the defendants’ objection to the trial court’s consideration of two class actions involving polybutylene pipe which have reached an approved settlement:
Cox v. Shell Oil,
Defendants argue that the trial court erred in relying on Cox because of several key differences. First, the initial class certification in Cox was not contested and ultimately became part of a settlement class. The Cox defendants reserved the right to oppose class certification for trial purposes if the settlement was not approved. Defendants note that when a class is certified for settlement purposes only, there will be no discovery and no trial; therefore, many of the legal difficulties of a multistate class action are eliminated, including most choice-of-law questions. Second, the Cox plaintiff class was limited to persons who owned polybutylene pipe used in certain applications and with leakage. In this case, the class is not limited to specific applications and does not exclude persons who have not experienced leakage. Plaintiffs dispute these arguments and submit that Cox and Spencer provide a master plan for the handling of this case, which is considerably smaller and less complex.
On the record before us, we cannot resolve the parties’ dispute as to whether the classes in
Cox
and
Spencer
were certified for settlement purposes only. If the classes were certified for settlement only, different conflict of law and manageability issues were presented and the cases may be of little guidance. See
Amchem
Products,
Inc. v.
Windsor,
However, it is not an abuse of discretion to consider tiróse cases where similar issues were presented as long as that consideration is not a substitute for, but merely a part of, the trial court’s careful and rigorous analysis of whether all the prerequisites of K.S.A. 2003 Supp. 60-223 are satisfied.
Reversed and remanded with directions.
