Idaho Filing a Motion for Joiner of Party is a legal process used to add a party to a lawsuit. The court must approve the motion, which requires a written application and a hearing. There are two types of Joiner of Party in Idaho: permissive joiner and compulsory joiner. Permissive joiner is when the court allows additional parties to be joined to an already existing action, and compulsory joiner is when a party is required to be joined in order to properly adjudicate the lawsuit. In either case, the parties must be joined in order for the court to have jurisdiction over them. The motion must demonstrate that the additional parties are necessary for the lawsuit and that the parties have a valid interest in the outcome of the lawsuit. The motion must also describe the relationship between the parties and how they will contribute to the lawsuit.