Ill. Admin. Code tit. 4, § 850.40
a) If an individual desires to file a formal written grievance, the individual shall promptly, but no later than 90 days after the alleged discrimination, submit the grievance to the Designated Coordinator in writing on the grievance form prescribed for that purpose. The grievance form must be completed in full in order to receive proper consideration by the Designated Coordinator, and shall include: