course of performance

: a contractual relationship where parties follow previous patterns of conduct.

See U.C.C. § 1-303(a) A “course of performance” is a sequence of conduct between the parties to a particular transaction that exists if: (1) the agreement of the parties with respect to the transaction involves repeated occasions for performance by a party; and (2) the other party, with knowledge of the nature of the performance and opportunity for objection to it, accepts the performance or acquiesces in it without objection.

Compare Course of dealing.