Your theory must also be based on the law. For example, if you are accused of deliberately crashing into someone’s car, your theory of the case may be that the victim was negligent when she backed into the road. Unfortunately, the plaintiff’s negligence will not relieve you of liability if you deliberately hit her. Therefore, your “theory of the case” could instead be that you didn’t deliberately hit her but only negligently did, or that she deliberately backed into you.
A lawsuit is a proceeding by a party or parties against another in the civil court of law. The archaic term "suit in law" is found in only a small number of laws still in effect today. The term "lawsuit" is used in reference to a civil action brought in a court of law in which a plaintiff, a party who claims to have incurred loss as a result of a defendant's actions, demands a legal or equitable remedy. The defendant is required to respond to the plaintiff's complaint. If the plaintiff is successful, judgment is in the plaintiff's favor, and a variety of court orders may be issued to enforce a right, award damages, or impose a temporary or permanent injunction to prevent an act or compel an act. A declaratory judgment may be issued to prevent future legal disputes.