One or more members of a class may sue or be sued as representative parties on behalf of all the persons constituting the class only if (1) the class is so numerous that the 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.
Puerto Rico Legal Code