A Practice Note providing guidance on drafting a Massachusetts Superior Court pleading in which a civil defendant asserts claims against a person who is allegedly liable for any liability the defendant incurs on the plaintiff's claim. Third-party claims may seek indemnification, contribution, or similar relief. This Practice Note explains the nature of third-party claims in Massachusetts Superior Court, considerations in deciding whether to plead them, and how to draft, serve, and file them. Finally, this Note addresses answers to these claims, replies to answers, and claims directly between the plaintiff and the third-party defendant.