Delivering legal papers is called "service of process". The law says that legal papers have to be "served" (delivered) the right way.In many civil actions, before the case is resolved there takes place a process known as pretrial discovery. This summary describes the process. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. Interrogatories are a discovery tool that the parties can use to have specific questions about a case answered before trial. The purpose of your interrogatories should be to uncover evidence for your case. When responding to interrogatories, it's important to provide complete and truthful answers. Interrogatories are written questions to be answered. â–ˇ Fill in the case information.