You must complete discovery 30 days before your trial. This guide contains forms and instructions for responding to Requests for Production from your opponent in a California civil case.Discovery is how you gather the evidence you will need to prove your case as plaintiff, or defeat the plaintiff's case as a defendant. This guide contains forms and instructions for propounding Requests for Production on your opponent in a California civil case. This article will provide a general overview of federal discovery and deposition procedure, with particular attention to important changes made to the Rules. Discovery is an important tool for parties in a lawsuit to get information to prepare for trial and to decide what issues to focus on in a case.