Which rule limits the impact of waiver and estoppel on contract terms by disallowing oral evidence before contracts were made?

The Parol Evidence Rule is fundamental in contract law as it governs the admissibility of oral or extrinsic evidence intended to change, contradict, or add to the terms of a written contract that the parties have executed. When a contract is fully integrated, meaning it contains all the terms agreed upon by the parties, the Parol Evidence Rule restricts the introduction of any prior oral agreements or statements that may conflict with or modify the written terms of the contract. This principle helps to maintain the integrity of written agreements by ensuring that the terms expressed within the document are the final and conclusive statement of the parties' intentions.

In the context of waiver and estoppel, the Parol Evidence Rule effectively limits how these doctrines can influence the enforcement of a contract's terms since it disallows any oral evidence that predates or modifies the written contract. This rule ensures that once parties have documented their agreement, they cannot later assert that previous negotiations or oral statements should alter the understanding established in the written document.

The other options do not pertain specifically to the limitation of oral evidence in relation to contract terms. The Consideration Rule involves the necessity of consideration for a contract to be enforceable. The Statute of Frauds deals with certain types of contracts that must