A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. Set 1 interrogatories has some lengthy responses and documentation.Set 2 interrogatories are basically the same questions from the opposing attorney. Write your Interrogatories. ​​ Write simple questions that may help you prove or defend your case. If there are multiple parties, you can serve up to 30 interrogatories to each party. Read the Rule: Md. Rule 2-421(a). A party may serve on any other party no more than 40 written interrogatories, including all discrete subparts. "Interrogatories" are written questions to the other side. The reality is that if there are mistakes made in the interrogatories, it is almost always the attorney's fault.