A Practice Note setting out the key issues that counsel must consider before using interrogatories in a federal civil lawsuit under Rule 33 of the Federal Rules of Civil Procedure (FRCP). Specifically, this Note discusses the purposes of interrogatories, the rules on interrogatories, who may use and receive interrogatories, the limit on the number of interrogatories a party may serve, the types of information requested through interrogatories, the best use for interrogatories, and when to serve interrogatories.