The full name and complete last known address of every witness to the occurrence complained of. 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. Answer to interrogatories. 1. Abode service is accomplished when the process server leaves a copy of the summons at the defendant's usual place of abode with someone age 13 or older. In many civil actions, before the case is resolved there takes place a process known as pretrial discovery. This summary describes the process. Which the person is required to appear, produce written answers to interrogatories, produce documentary material or give oral testimony.