Interrogatories are a discovery tool (among many) used in lawsuits in New York courts. In sum, these are written questions seeking specific information.1. Except as otherwise provided herein, after commencement of an action, any party may serve upon any other party written interrogatories. In many civil actions, before the case is resolved there takes place a process known as pretrial discovery. This summary describes the process. 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. Section R3132 - Service of interrogatories. After commencement of an action, any party may serve written interrogatories upon any other party. This is a how-to guide on interrogatories and requests for production in Washington divorce and family law cases.