In many civil actions, before the case is resolved there takes place a process known as pretrial discovery. This summary describes this process.Information is obtainable as provided in these rules through any of the following discovery methods: depositions upon oral examination or written questions. CPLR 3120: Discovery and production of documents and things for inspection, testing, copying or photographing. This is the formal process of exchanging information between the parties about the witnesses and evidence they ll present at trial. PLEASE TAKE NOTICE, that pursuant to Rule 3120 of the Civil Practice Law and Rules,. 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. This article will explain how attorneys outside of Illinois can get their subpoena issued in Illinois. A party must produce documents as they are kept in the usual course of business or must organize and label them to correspond to the categories in the request.