The fact pattern
Read it twice before you look at the answer
A buyer signs a written contract to purchase a used truck for $12,000. The writing describes the truck, the price, and the closing date, and contains a clause stating: 'This document is the complete and final agreement between the parties.' The buyer claims that, the day before signing, the seller orally promised to replace the truck's worn tires before closing. The seller denies it and refuses. The buyer sues to enforce the tire promise.
Try it before you scroll
Spend 15 minutes writing your own IRAC answer first — the model below is far more useful after you have committed to your own issue list. These issues are in the facts:
- Whether the writing is an integrated agreement
- The parol evidence rule and prior oral agreements
- Effect of a merger / integration clause
- Whether the tire promise contradicts or merely supplements the writing
Model IRAC answer
One way to write it — not the only way. Compare it to yours.
Issue
Whether the buyer may introduce evidence of the seller's prior oral promise to replace the tires when the signed contract contains a clause declaring it the complete and final agreement.
Rule
The parol evidence rule bars the use of prior or contemporaneous agreements to contradict or, where the writing is fully integrated, to supplement the terms of a final written contract. A writing is fully integrated when the parties intend it as the complete and exclusive statement of their agreement; a merger (integration) clause is strong evidence of full integration. If a writing is only partially integrated, consistent additional terms may be admitted. Evidence offered to show fraud, mistake, or to interpret an ambiguous term is generally not barred.
Application
The threshold question is integration. The contract contains an express clause stating it is 'the complete and final agreement,' which is a merger clause and strong evidence that the parties intended the writing to be fully integrated. If the writing is fully integrated, the parol evidence rule bars not only contradictory prior terms but also additional consistent terms — and the alleged oral tire promise is a prior agreement the buyer is trying to add.
The buyer's best argument is that the tire promise is a separate, collateral agreement that does not contradict the writing and that a reasonable buyer might naturally leave out of the main document — a theory some courts allow even against a merger clause. The seller will counter that a merger clause exists precisely to foreclose such side claims and that replacing the tires is the kind of term the parties would have included if intended. The buyer has not alleged fraud, which would otherwise open the door, so the integration question controls.
Conclusion
Because the contract contains a merger clause indicating full integration, the parol evidence rule most likely bars the prior oral tire promise. The buyer can prevail only if the court treats the promise as a collateral agreement outside the integration or finds the writing only partially integrated despite the clause.
Verify before you rely on this. This is an original teaching example, not legal advice. Rules vary by jurisdiction and by your professor's framing — check every rule statement against your casebook and class notes before using it.
Now try it timed.
Open the IRAC Practice Gym, set a 15-minute timer, and write your own answer to this fact pattern. You get feedback that helps you think — never an answer written for you.