UCC § 1-201

Section 1-201 is the UCC's master definition section. Two definitions matter most at the start of a contracts course. "Agreement" (§ 1-201(b)(3)) means the bargain of the parties in fact, as found in their language or inferred from course of performance, course of dealing, or usage of trade. "Contract" (§ 1-201(b)(12)) means the total legal obligation that results from the parties' agreement as determined by the Code and other applicable law. The distinction between agreement (what the parties actually bargained for) and contract (the total legal obligation, including terms supplied by law) runs throughout Article 2.

The doctrinal move is to build flexibility into the formation and interpretation framework. Because "agreement" includes conduct and trade usage, the UCC's definitional foundation aligns with the extrinsic-evidence approach to interpretation: what counts is not just the signed document but the full context of the parties' dealings. The R2d § 2 definition of "agreement" is parallel but reached through the subjective/objective interpretation debate Chapter 1 introduces.

The agreement/contract distinction matters in Chapter 16 (extrinsic evidence) and Chapter 17 (parol evidence rule). An argument that a trade usage forms part of the agreement relies on § 1-201(b)(3)'s incorporation of usage. An argument that the written document is the complete contract relies on § 1-201(b)(12)'s phrase "as determined by the Code."

Students often use "agreement" and "contract" interchangeably. Ask: does it matter whether we call the parties' exchange an agreement or a contract? Then show them the Nānākuli Paving v. Shell Oil materials in Chapter 16, where what counted as the parties' "agreement" — whether trade usage was part of it — determined the outcome.

Connect to UCC § 1-103 (supplementary common law principles), UCC § 2-202 (parol evidence rule for goods), and R2d § 2 (definition of promise). The statutory supplement in the casebook prints both § 1-201(b)(3) and § 1-201(b)(12), which students should treat as the working definitions for every UCC problem in the course.