Ian Ayres, Yale Law School professor, covers the law governing third party interests in contracts as part of his American Contract Law course. The lecture works through assignment, where a party transfers contractual rights to someone outside the original agreement, and delegation, where a party transfers the duty to perform. Ayres distinguishes both from third party beneficiary doctrine, where someone who never signed the contract can still enforce it because the original parties intended to benefit them. Drawn from the Coursera version of Ayres' course, the talk uses short doctrinal explanations rather than case narration, aimed at students already familiar with basic offer and acceptance principles. At sixteen minutes it stays narrow and specific, treating assignment, delegation, and third party rights as three related but legally distinct problems within contract law.