California, United States of America
The following excerpt is from Rosen v. Bank of Am., N.A., G046336 (Cal. App. 2012):
"To be enforceable, a promise must be definite enough that a court can determine the scope of the duty[,] and the limits of performance must be sufficiently defined to provide a rational basis for the assessment of damages." (Ladas v. California State Auto. Assn. (1993) 19 Cal.App.4th 761, 770.) Appellants did not allege a sufficiently clear and unambiguous promise.
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