Cite as: 521 U. S. 591 (1997)
Opinion of the Court
their varying medical expenses, smoking histories, and family situations."). Predominance is a test readily met in certain cases alleging consumer or securities fraud or violations of the antitrust laws. See Adv. Comm. Notes, 28 U. S. C. App., p. 697; see also supra, at 615, 616. Even mass tort cases arising from a common cause or disaster may, depending upon the circumstances, satisfy the predominance requirement. The Advisory Committee for the 1966 revision of Rule 23, it is true, noted that "mass accident" cases are likely to present "significant questions, not only of damages but of liability and defenses of liability, . . . affecting the individuals in different ways." Adv. Comm. Notes, 28 U. S. C. App., p. 697. And the Committee advised that such cases are "ordinarily not appropriate" for class treatment. Ibid. But the text of the Rule does not categorically exclude mass tort cases from class certification, and District Courts, since the late 1970's, have been certifying such cases in increasing number. See Resnik, From "Cases" to "Litigation," 54 Law & Contemp. Prob. 5, 17-19 (Summer 1991) (describing trend). The Committee's warning, however, continues to call for caution when individual stakes are high and disparities among class members great. As the Third Circuit's opinion makes plain, the certification in this case does not follow the counsel of caution. That certification cannot be upheld, for it rests on a conception of Rule 23(b)(3)'s predominance requirement irreconcilable with the Rule's design.
B
Nor can the class approved by the District Court satisfy Rule 23(a)(4)'s requirement that the named parties "will fairly and adequately protect the interests of the class." The adequacy inquiry under Rule 23(a)(4) serves to uncover conflicts of interest between named parties and the class they seek to represent. See General Telephone Co. of Southwest v. Falcon, 457 U. S. 147, 157-158, n. 13 (1982). "[A] class representative must be part of the class and 'pos-
625
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