This guide is intended to be a summary of basic discovery procedures. Interrogatories are written questions that require written answers under oath.A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. Fill in the "certificate of service" on the last page before mailing them back to the other side. How To Respond To Requests for Production of Documents. If it is a contract dispute and quite complicated, you would need to have an attorney. The grounds for objecting to an interrogatory must be stated with specificity. The Daily Journal has more journalists covering the California legal profession than any other publication.