457 U.S. 147 (1982) Cited 5,739 times 33 Legal Analyses
Holding that named plaintiff must prove “much more than the validity of his own claim”; the individual plaintiff must show that “the individual's claim and the class claims will share common questions of law or fact and that the individual's claim will be typical of the class claims,” explicitly referencing the “commonality” and “typicality” requirements of Rule 23
Fed. R. Civ. P. 23 Cited 35,598 times 1241 Legal Analyses
Holding that, to certify a class, the court must find that "questions of law or fact common to class members predominate over any questions affecting only individual members"