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In a civil action, an interrogatory is a list of questions one party sends to another as part of the discovery process. The recipient must answer the questions under oath and according to the case's schedule. Because attorneys may help their clients answer interrogatories, interrogatory responses tend to be more finely crafted than answers to deposition questions. The number of questions included in an interrogatory is usually limited by court rule. For example, under the Federal Rules of Civil Procedure, each party may only ask each other party 25 questions via interrogatory unless the court gives permission to ask more. See Rule 33.

Interrogatory rules vary by jurisdiction. See State Civil Procedure Rules. In the Federal Rules of Civil Procedure, Rule 33 governs interrogatories.

See Civil Procedure.