When an essential party is not included in a civil suit, the first step is to identify whether the missing party qualifies as a “necessary” or “proper” party—someone whose presence is crucial for a complete and fair decision. Once confirmed, the next step is to file an application for impleadment under procedural rules such as Order I Rule 10 of the Civil Procedure Code (CPC), requesting the court to add the missing party. If you’re the plaintiff, you should act promptly to avoid dismissal or delay; if you’re the defendant, you can raise a preliminary objection citing non-joinder. Experienced lawyers emphasize early case assessment, reviewing contracts, ownership documents, or relationships involved to ensure all interested parties are included. They also recommend maintaining detailed records and proactively addressing any objections from the opposing side. Ultimately, handling non-joinder effectively requires timely action, procedural awareness, and strategic communication with the court to prevent unnecessary complications or case dismissal.