Definition[]
An integrated contract is meant to be a final expression of the agreement between the parties. A fully-integrated contract contains all the terms and provisions intended to be included in the agreement and there is nothing outside the four corners of the document that should amend or modify the terms in any way, or be required to interpret anything contained within.
Overview[]
The parol evidence rule prohibits the introduction of outside oral or written evidence to contradict or supplement a fully-integrated contract. Additional evidence may be introduced, however, to supplement a partially-integrated contract (anything other than a fully-integrated contract), and modernly to help interpret an ambiguity on the face of either type of agreement.