LEGAL PRINCIPLE: CIVIL PROCEDURE – Joinder of Parties – Test for Determining a Necessary Party

Joinder jurisdiction depends on necessity. A person’s presence is “necessary” when: (1) their absence would prevent the court from completely determining the issues; (2) their rights would be affected by the judgment; (3) justice requires their participation to avoid multiplicity of proceedings. Joinder is jurisdictional—courts can only join necessary parties, not merely convenient or desirable ones. The test is functional: what is the “prescribed purpose” (adjudicating the dispute), and is this person’s presence necessary for that purpose? Necessity is assessed objectively considering the issues, reliefs sought, and potential effect on the person. If not necessary, the court lacks jurisdiction to order joinder regardless of other considerations. This prevents improper expansion of litigation to include peripheral parties while ensuring all necessary parties are present for complete adjudication.