A Practice Note setting out the key issues counsel must consider before using interrogatories in a civil lawsuit under Article 31 of the New York Civil Practice Law and Rules (CPLR). This Note discusses the purposes of interrogatories, the rules governing interrogatories, who may use interrogatories, who may be served with interrogatories, restrictions on other discovery devices, the limit on the number of interrogatories a party may serve, what information can be requested through interrogatories, and the best use for interrogatories.