Rule 23.01: Prerequisites to a Class Action.

One or more members of a class may sue or be sued as representative parties on behalf of all 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 interest of the class.