Experienced lawyers prevent improper joinder by starting with a claim-by-claim analysis: they first list every cause of action, then match each one to the correct defendant, and ask whether all of them arise from the same transaction, series of transactions, or share a common question of law or fact. Any claim that is remote in time, based on a different contract, or involves a different set of rights is either dropped or put in a separate suit. While drafting, they explicitly cite the relevant civil procedure rule to show that joinder is intentional, not accidental, and they structure the plaint so that facts, parties, and reliefs are clearly segregated to avoid confusion. As a step-by-step practice, they (1) define the core dispute, (2) group only connected parties, (3) test joinder against the rule, (4) check for prejudice or forum-manipulation, and (5) get a peer or senior review before filing. This disciplined approach keeps pleadings clean, defensible, and resistant to procedural objections.