Wisconsin Summons on a Third-Party Complaint is a legal document that is issued by a court in Wisconsin to a person (third-party) who is not named as a defendant in the original complaint, but who may have information or evidence relevant to the case. This summons requires the third party to appear before the court and provide testimony and/or documents related to the case. There are two types of Wisconsin Summons on a Third-Party Complaint: 1) Summons to Appear and 2) Summons to Produce. The Summons to Appear requires the third party to appear in court at a specified time to provide testimony. The Summons to Produce requires the third party to appear with documents or other evidence relevant to the case.