Illinois Third Party Summons in a Civil action (Paper Issuance) is a legal document that is issued to an individual, business, or entity that is not a party to the lawsuit but is involved in some way. It is a legal notice requiring the third party to appear in court and provide testimony or documents related to the case. There are two types of Third Party Summons in a Civil action (Paper Issuance) in Illinois: a Summons to Answer and a Summons to Appear. A Summons to Answer is served on the third party and requires them to answer questions or provide documents relevant to the case. A Summons to Appear is served on the third party and requires them to appear in court at a set date and time to provide testimony or documents relevant to the case.