Washington Confirmation of Joiner of Parties Claims And Defenses is a document used in Washington state that formally adds a party to a lawsuit or confirms the joiner of a party to a lawsuit. This document is used to extend the legal rights and liabilities of the new party to the suit. It also extends the case’s time limitations of claims and defenses. There are two types of Washington Confirmation of Joiner of Parties Claims And Defenses: voluntary joiner and compulsory joiner. Voluntary joiner is when a party voluntarily chooses to join the lawsuit and accept the rights and liabilities of a party. Compulsory joiner is when a party is required to join the lawsuit due to a court order. In either case, the Washington Confirmation of Joiner of Parties Claims And Defenses must be filed with the court to formally add the party to the lawsuit.