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What is the Difference Between an Interrogatory and a Deposition?

Karyn Maier
Updated May 23, 2024
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When two opposing parties are preparing to go to trial, the litigants may use two methods of obtaining important information about the facts surrounding the case: The interrogatory and the deposition. While both involve questioning of the opposing party as part of the pretrial discovery process, they serve entirely different functions. In fact, there is a fundamental difference between an interrogatory and a deposition.

An interrogatory, also known as a Request for Further Information, is a set of written questions posed to the opposite party that must be answered truthfully, in writing, under the penalty of perjury. In the U.S., the number of questions contained within an interrogatory and how many parties may be served to answer is governed by the Federal Rules of Civil Procedure. However, pursuant to civil law, local courts may further restrict the process. Generally, though, the number of questions per interrogatory is limited to 25 per party. In addition, since interrogatories are often used for the purpose of clarifying simple background information about the litigants, many lawyers prefer to use generic, pre-printed form interrogatories.

The use of the interrogatory is more common in civil procedures than in other types of actions, such as cases involving criminal law. For instance, it can be a valuable tool in a divorce lawsuit, where discovery of income and assets is necessary to determine equitable distribution between the parties. Interrogatories are also commonly used in personal injury lawsuits where negligence of the opposing party is alleged. Aside from providing background information, the interrogatory allows both parties to discover what facts and allegations will be presented at trial. However, there is one instance where an interrogatory may not be used--to take evidence from a witness.

Pre-trial discovery evidence to be gained from a witness is taken by deposition under oath. The witness, or deponent, is asked a series of questions by the opposing attorney directly and the entire process is recorded (and sometimes videotaped), as well as documented in a written transcript prepared by a court reporter. The opposing party and counsel are entitled to attend the deposition of any witness.

The deposition is a particularly useful device that may be used at trial to present first-hand witness testimony in the event that the witness becomes unavailable. For instance, if the witness in question were to become deceased prior to trial commencing, the transcript of his or her deposition may be provided to the jury in place of live testimony in the courtroom. In addition, it may be used to allege impeachment of the witness if live testimony contradicts admissions previously made during the deposition. Statements made during a deposition may also be used when a witness has difficulty recalling events relevant to the case.

Language & Humanities is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Karyn Maier
By Karyn Maier
Contributing articles to Language & Humanities is just one of Karyn Maier's many professional pursuits. Based in New York's Catskill Mountain region, Karyn is also a magazine writer, columnist, and author of four books. She specializes in topics related to green living and botanical medicine, drawing from her extensive knowledge to create informative and engaging content for readers.
Discussion Comments
By Glasis — On Feb 05, 2014

An interrogatory is similar to a motion for discovery.

In a discovery motion, one party asks the court to order another to provide specific information related to a case. This is usually done when a party has been less-than-forthcoming with requested documents.

If the judge grants the discovery motion and the party still does not comply, they can be held in contempt of court.

Once the information sought is provided, the requesting party examines it in preparation for a trial or to decide whether to file further complaints.

Karyn Maier
Karyn Maier
Contributing articles to Language & Humanities is just one of Karyn Maier's many professional pursuits. Based in New...
Learn more
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