An integrated contract can be completely or partially integrated. It is said to be partially integrated when only some of the terms that the parties agreed on is contained in the agreement. Therefore in a partially integrated contract other terms to which the parties might have agreed will be absent. If the contract is only partially integrated, evidence of consistent additional terms is admissible in order to supplement the written agreement. However, courts generally exclude any evidence which contradicts the writing and allow parol evidence only to add to the terms of a partially integrated contract.