Rule 1702. Prerequisites to a Class Action

One or more members of a class may sue or be sued as representative parties on behalf of all members in a class action 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;

(4) the representative parties will fairly and adequately assert and protect the interests of the class under the criteria set forth in Rule 1709; and

(5) a class action provides a fair and efficient method for adjudication of the controversy under the criteria set forth in Rule 1708.