An Illinois Petition For Rule To Show Cause is a legal document that is filed in a court of law to compel a party to appear before the court to explain why they should not be held in contempt or why an order should not be issued against them. This petition is commonly used when a party has failed to comply with a court order, such as failure to pay child support or to appear in court. There are three main types of Illinois Petition For Rule To Show Cause: Petition to Show Cause for Non-Payment of Child Support, Petition to Show Cause for Non-Appearance, and Petition to Show Cause for Contempt.