Class Actions

(a) Prerequisites. — One or more members of a class may sue or be sued as representative parties on behalf of all members 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. (b) Types of Class Actions. — A class action may be maintained if Rule 23(a) is satisfied and if: (1) prosecuting separate actions by or against individual class members would create a risk of: (A) inconsistent or varying adjudications with respect to individual class members that would establish incompatible standards of conduct for the party opposing the class; or (B) adjudications with respect to individual class members that, as a practical matter, would be dispositive of the interests of the other members not parties to the individual adjudications or would substan- tially impair or impede their ability to protect their interests; (2) the party opposing the class has acted or refused to act on grounds that apply generally to the class, so that final injunctive relief or corresponding declaratory relief is appropriate respecting the class as a whole; or (3) the court finds that the questions of law or fact common to class members predominate over any questions affecting only individual mem- bers, and that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy. The matters pertinent to these findings include: (A) the class members’ interests in individually controlling the prosecu- tion or defense of separate actions; (B) the extent and nature of any litigation concerning the controversy already begun by or against class members; 65 RULES OF CIVIL PROCEDURE