§12A-1-205.

§12A-1-205.
   
   (1) A course of dealing is a sequence of previous conduct between the
   parties to a particular transaction which is fairly to be regarded as
   establishing a common basis of understanding for interpreting their
   expressions and other conduct.
   
   (2) A usage of trade is any practice or method of dealing having such
   regularity of observance in a place, vocation or trade as to justify
   and expectation that it will be observed with respect to the
   transaction in question. The existence and scope of such a usage are
   to be proved as facts. If it is established that such a usage is
   embodied in a written trade code or similar writing the interpretation
   of the writing is for the court.
   
   (3) A course of dealing between parties and any usage of trade in the
   vocation or trade in which they are engaged or of which they are or
   should be aware give particular meaning to and supplement or qualify
   terms of an agreement.
   
   (4) The express terms of an agreement and an applicable course of
   dealing or usage of trade shall be construed wherever reasonable as
   consistent with each other; but when such construction is unreasonable
   express terms control both course of dealing and usage of trade and
   course of dealing controls usage of trade.
   
   (5) An applicable usage of trade in the place where any part of
   performance is to occur shall be used in interpreting the agreement as
   to that part of the performance.
   
   (6) Evidence of a relevant usage of trade offered by one party is not
   admissible unless and until he has given the other party such notice
   as the court finds sufficient to prevent unfair surprise to the
   latter.