Improper joinder of causes of action often arises from careless drafting, such as combining unrelated claims, including unnecessary parties, or using vague and overlapping pleadings that blur distinct legal issues. The best lawyers prevent these errors through a systematic, step-by-step review—first identifying each cause of action clearly, then aligning it with the correct parties, factual basis, and specific relief sought. They ensure each claim is independently structured, supported by relevant documents, and compliant with procedural rules under the CPC. By conducting a thorough final review, often with senior counsel input, and promptly seeking amendments if inconsistencies are found, experienced lawyers maintain clarity, procedural compliance, and fairness, thereby avoiding dismissal on grounds of improper joinder.