Wisconsin Third-Party Summons is a process used in Wisconsin courts to bring a non-party to a lawsuit. A Third-Party Summons may be issued when a party believes that a third party is responsible for all or part of the plaintiff's claim, or when a third party possesses knowledge that would be helpful in determining the facts of the case. There are two types of Wisconsin Third-Party Summons: Standard Summons and Third-Party Summons for Discovery. The Standard Summons is used when a party believes that a third-party may be held liable or responsible for all or part of a plaintiff's claim. The Third-Party Summons for Discovery is used to obtain information or documents from a non-party that may be helpful in determining the facts of the case.