For a class action lawsuit to proceed, it must meet certain legal criteria. These include:
1. Numerosity: The class is so large that individual lawsuits would be impractical. 2. Commonality: There are common questions of law or fact across the class. 3. Typicality: The claims or defenses of the representative parties are typical of the class. 4. Adequacy: The representative parties will fairly and adequately protect the interests of the class.