Top lawyers treat non-joinder as a fixable procedural defect, not a disaster, and follow a clear step-by-step method: first, they spot the issue early by asking whether the court can pass a complete, workable decree without that missing person; second, they put the objection on record immediately—either in the written statement (if for the defendant) or via an application admitting the omission (if for the plaintiff); third, they file an impleadment application (e.g., under Order I Rule 10 CPC in India), explaining why the person is a “necessary party,” seeking to add them in the memo of parties, and asking for consequential amendments in pleadings and prayer; fourth, they ensure proper service and opportunity to be heard is given to the newly added party so that no one later claims violation of natural justice; fifth, they request the court to settle issues of maintainability and non-joinder at the issues-framing stage, so the defect doesn’t resurface at final arguments; and throughout, they keep an eye on limitation, execution, and strategy, making sure that once the defect is cured, any decree passed will actually bind all relevant parties and won’t be attacked later as incomplete or unenforceable.