Improper joinder of causes of action in civil law means combining multiple claims in one suit even though they do not arise from the same transaction or series of transactions, and do not share common questions of law or fact—making the pleadings confusing, prejudicial, or procedurally defective. Lawyers identify this error by examining whether each claim has different parties, facts, reliefs, evidence, or limitation periods, which signals that they should not be tried together. The best way to deal with it step by step is to raise the objection early, file for severance of causes under Order II Rule 6 CPC, seek amendment of pleadings to separate unrelated claims, adjust parties under Order I Rule 10 if required, and ask the court to frame distinct issues or order separate trials. By clarifying facts, organizing reliefs properly, and ensuring compliance with procedural rules, advocates can correct the defect efficiently while maintaining fairness and clarity in the proceedings.