Yale law professor Ian Ayres examines Alaska Northern Development, Inc. v. Alyeska Pipeline Service Co. as a vehicle for teaching contract interpretation under UCC section 2-202, the parol evidence rule provision governing how courts treat prior agreements and extrinsic evidence against a written contract. Part of the Contract Performance unit in Ayres' American Contract Law course, originally produced for Coursera, the lecture walks through the case facts and the court's reasoning on when trade usage, course of dealing, and prior negotiations may supplement or contradict a written agreement. Ayres uses the dispute to illustrate the tension between formalist and contextualist approaches to reading contract language. The lecture runs fourteen minutes and assumes some familiarity with basic UCC concepts, functioning as one segment in a structured sequence on contract doctrine rather than a standalone survey.