Written by attorneys · grounded in primary & secondary sources — see below
in contract law
A situation in which the parties' manifestations of assent appear to agree but they attach different meanings to a term. No contract forms on that term if neither party knows or has reason to know of the meaning attached by the other.
Sources & Authorities
How it applies
Common Examples
6
Deed Acceptance After Closing Dispute
Melissa Mills sold property to Marco Marquez under a contract requiring the seller to repair the roof before closing. At closing Melissa delivered a deed silent on repairs, and Marco accepted it without objection. After closing Marco discovered the roof remained unrepaired and sued for breach of the contract term. The court held that merger discharged the repair promise because the parties' conduct showed no mutual understanding that the obligation would survive the deed.
Unrepresented Party Role Confusion
Maria Morales, an unrepresented seller, met with attorney Ming Ma who represented the buyer in a land deal. Maria believed Ming was neutral and would protect her interests during negotiations. Ming realized the misunderstanding but continued without correction and gave Maria advice on price. The disciplinary authority found that Ming violated the duty to correct the misunderstanding about his role.
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Cases
Model Codes
Common Law
Restatements
Study Supplements
Dictionaries
Certification Claim on Letterhead
Michael Miller advertised on firm letterhead that he was a certified trial specialist. State regulators claimed the statement would mislead the public about the certifying body's status. Miller showed that the certification was from a recognized national board and added a clarifying disclaimer. The Court held the truthful statement with disclaimer was protected speech and did not create actionable misunderstanding.
Collateral Promise After Deed Delivery
Madison Meyers sold land to Matrix Technologies under a contract that included a promise to build a boundary fence after closing. The deed contained no mention of the fence. After closing Matrix demanded performance of the fence promise. The court examined the parties' intent and held the independent promise survived merger because it was collateral to the conveyance and not intended to merge.
Employment Contract Termination Understanding
Millennium Media terminated Marco Marquez after he reported coworker misconduct. The employment agreement was silent on at-will status, and internal documents showed each side attached a different meaning to the termination clause. Because neither party knew of the other's divergent understanding, the court found no enforceable contract term on that point and allowed the claim to proceed.
Foley v. Interactive Data Corp.47 Cal. 3d 654, 254 Cal. Rptr. 211, 765 P.2d 373
IVF Consent Form Interpretation
Michael Miller and Maria Morales signed an IVF consent form that each read differently regarding disposition of preembryos upon divorce. Internal notes confirmed neither knew the other's intended meaning at signing. The court held that the misunderstanding on a material term prevented formation of an enforceable agreement on that issue.
A.Z. v. B.Z.431 Mass. 150, 725 N.E.2d 1051 (2000)
Common questions
Frequently Asked
5
When does a misunderstanding prevent contract formation?+
No contract forms on a term if the parties attach different meanings to it and neither knows nor has reason to know of the meaning attached by the other. The Restatement treats this as a failure of mutual assent on that term.
How does misunderstanding differ from mutual mistake?+
Misunderstanding occurs when parties attach different meanings to language at formation. Mutual mistake occurs when both parties share the same erroneous belief about an existing fact. The former defeats assent. The latter may make the contract voidable.
Does a merger clause eliminate claims based on misunderstanding?+
A merger clause does not bar claims grounded in fraud or mutual mistake. Courts examine the parties' intent and the nature of the promise to decide whether an independent understanding survives the deed.
What must a lawyer do when an unrepresented person misunderstands the lawyer's role?+
The lawyer must make reasonable efforts to correct the misunderstanding. The lawyer may not give legal advice to the unrepresented person if the interests conflict.
Can a lawyer advertise a certification without creating misunderstanding?+
A truthful statement of certification by a recognized body is protected commercial speech. The state may require clarifying disclaimers to prevent misunderstanding about the certifying organization's status.
501 U.S. 663 (1991)Torts
…contractually binding because these promises are usually given clandestinely and orally, hence they are often vague, subject to misunderstanding, and a fertile breeding ground for lawsuits. See Ruzicka v. Conde Nast Publications, Inc. , 733 F.Supp. 1289, 1300-01 (D.Minn.1990) (a promise not to make a source identifiable found too…