A cause of action or right of action, in law, is a set of facts sufficient to justify suing to obtain money or property, or to justify the enforcement of a legal right against another party. The term also refers to the legal theory upon which a plaintiff brings suit. The legal document which carries a claim is often called a 'statement of claim' in English law, or a 'complaint' in U.S. federal practice and in many U.S. states. It can be any communication notifying the party to whom it is addressed of an alleged fault which resulted in damages, often expressed in amount of money the receiving party should pay/reimburse.