To file a class-action lawsuit, first, have a lawyer look at your case to determine whether it is credible and if you have a chance at winning. This will help in determining if other cases on the issue exist, looking at past similar cases to gauge the outcome, whether or not a statute of limitations applies, if others have also been impacted, and if it is the overall right course of action. The next step would be to file the complaint. The complaint will include all of the details regarding the class action, such as the individuals affected, the demands, the specific problem, and so on. The final step would then be a judge having to certify the class action based on all of the information provided.