Interrogatories are a helpful tool for discovery. Interrogatories are written questions which focus on any information relevant to the case.This packet provides general guidance about asking written questions, called "Interrogatories," to another party in the case. □ Fill in the case information. Interrogatories are written questions to be answered. The following interrogatories are to be reviewed and used as applicable to the facts of each case; delete and add as appropriate. You should respond to each interrogatory in the order received. Your answers to the interrogatories should usually be short, clear, and direct and should answer only the question that is being asked. A party may propound interrogatories at any point up to thirty (30) days before the end of the discovery period. Tex. The server also needs to state in his affidavit the complete address of service for the defendant.