A subpoena ad testificandum is a court summons to appear and give oral testimony for use at a hearing or trial.

(See subpoena ad testificandum for details.)

Later on, respondent Committees issued a Subpoena Ad Testificandum to petitioner, requiring him to appear and testify on 20 November 2007.

The subpoena duces tecum is similar to the subpoena ad testificandum, which is a writ summoning a witness to testify orally.

Meeting for the purpose of authorizing and issuing a subpoena ad testificandum for the appearance of Jon Corzine in conjunction with the hearing scheduled for Thursday, December 15, 2011.

The obligation of the individual to attend the court as a witness is enforced by a process of the court, particular process being the subpoena ad testificandum, commonly called the subpoena in the United States.

These include the right to be represented by counsel, the right to compulsory process (issue of subpoena ad testificandum and subpoena duces tecum) to secure the attendance of witnesses, gather evidence and the right to a speedy trial.