Local rules shall not require the filing of discovery. Any party serving discovery shall file a certificate of service of discovery document.{Amended April 22, 2013}. Download and complete Proof of Delivery forms from the Illinois Office of the Courts. All forms below with a "fillable icon" are documents that you can open "on-line", fill in the appropriate fields and then print on your printer. 1. 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. The purpose of the Rule's affidavit requirement is to determine the proper court division and scope of discovery at the outset of the litigation. To ensure you understand the discovery process in your divorce, our Cook County lawyer can help.