A Wisconsin Subpoena to Testify at a Deposition in a Civil Action — AO 88A is a legal document used to compel a person to appear and testify in a civil action in the state of Wisconsin. This document can either be issued by the court or by the parties involved in the case. It requires the person to appear and testify at a deposition or a trial. There are three types of Wisconsin Subpoena to Testify at a Deposition in a Civil Action — AO 88A: a Witness Subpoena, a Subpoena for Production of Documents, and a Subpoena for Deposition. A Witness Subpoena requires the person to appear and testify at the hearing, while a Subpoena for Production of Documents requires the person to bring along certain documents to court. Lastly, a Subpoena for Deposition requires the person to appear at a deposition and answer questions posed by attorneys of the parties involved.