The adoption of some action or inaction, or the change of a person's situation, based on a state of affairs assumed and adopted by that person upon a representation, promise, or assurance being made by another: Waltons Stores (Interstate) Ltd v Maher (1988) 164 CLR 387; 76 ALR 513. See also Detriment; Estoppel; Misrepresentation; Promissory estoppel

(Ref: Butterworths Concise Australian Legal Dictionary)