To get a certification in California, the plaintiff must establish that there is an ascertainable class and a well-defined community of interest among members. Community of interest is determined by three factors: 1) Predominant common questions of law or fact; 2) Class representatives with claims or defenses typical of all the members of the proposed class; and 3) Representatives who can adequately represent all the members of the class. Plaintiffs must also establish that resolving the claims in this type of lawsuit would provide substantial benefits to both the courts and the litigants. This involves showing that this type of lawsuit is superior to alternative methods of resolving the dispute(s), including individual litigation.