Any party serving discovery shall file a certificate of service of discovery document. {Amended April 22, 2013}.Illinois Legal Aid Online provides a guided interview called an Easy Form that will help you fill out the forms. In many civil actions, before the case is resolved there takes place a process known as pretrial discovery. This summary describes this process. 1. The full name and complete last known address of every witness to the occurrence complained of. Any party serving discovery shall file a Page 3 3 certificate of service of discovery document. If you did not use Adobe Acrobat or Reader, your computer will select a software that will allow you to fill out the forms. 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.