A party may direct written interrogatories to any other party. A copy of the interrogatories shall be served on all other parties entitled to notice.A party may use one or more interrogatories which are part of a form set of interrogatories. Interrogatories are written questions that one party sends to the other. The receiving party is required to answer these questions under oath. A party may serve written Interrogatories pursuant to Supreme Court Rule 213. Interrogatories and requests for admission are additional tools that parties can use to discover information before trial. The fact that the same counsel represents multiple parties does not change that each of those parties may serve up to 30 interrogatories. Yes, you must respond to 30, and no more than 30. Identify all documents which.