Cite as: 521 U. S. 591 (1997)
Opinion of the Court
excluded. See 7A C. Wright, A. Miller, & M. Kane, Federal Practice and Procedure § 1777, p. 517 (2d ed. 1986) (hereinafter Wright, Miller, & Kane); see generally Kaplan, Continuing Work 379-400. Rule 23(b)(3) "opt-out" class actions superseded the former "spurious" class action, so characterized because it generally functioned as a permissive joinder ("opt-in") device. See 7A Wright, Miller, & Kane § 1753, at 28-31, 42-44; see also Adv. Comm. Notes, 28 U. S. C. App., p. 695.
Framed for situations in which "class-action treatment is
not as clearly called for" as it is in Rule 23(b)(1) and (b)(2) situations, Rule 23(b)(3) permits certification where class suit "may nevertheless be convenient and desirable." Adv. Comm. Notes, 28 U. S. C. App., p. 697. To qualify for certification under Rule 23(b)(3), a class must meet two requirements beyond the Rule 23(a) prerequisites: Common questions must "predominate over any questions affecting only individual members"; and class resolution must be "superior to other available methods for the fair and efficient adjudication of the controversy." In adding "predominance" and "superiority" to the qualification-for-certification list, the Advisory Committee sought to cover cases "in which a class action would achieve economies of time, effort, and expense, and promote . . . uniformity of decision as to persons similarly situated, without sacrificing procedural fairness or bringing about other undesirable results." Ibid. Sensitive to the competing tugs of individual autonomy for those who might prefer to go it alone or in a smaller unit, on the one hand, and systemic efficiency on the other, the Reporter for the 1966 amendments cautioned: "The new provision invites a close look at the case before it is accepted as a class action . . . ." Kaplan, Continuing Work 390.
Rule 23(b)(3) includes a nonexhaustive list of factors pertinent to a court's "close look" at the predominance and superiority criteria:
615
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