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Parol Evidence Rule

Parol Evidence Rule

Learn about the parol evidence rule, which bars the use of extrinsic evidence to modify or supplement a written contract, the rationale for its use in interpreting contracts, its application to integrated agreements, and exceptions to the rule.


When interpreting a contract, courts may look to evidence to determine which terms may be enforced, as well as how those terms should be enforced. However, not all relevant evidence may be used to when proving the terms of the agreement. Today, you’ll be learning about the parol evidence rule and its effect on the use of evidence regarding the terms of a contract.

We’ll start off our discussion with the parol evidence rule itself. We’ll talk about what the parol evidence rule is, as well as...