Legal Principle: When, at the desire of the promisor, the promisee or, any other person has done or abstained from doing, or does or abstains from doing, or promises to do or to abstain from doing, something, such act or abstinence or promise, is called a consideration for the promise. Factual Situation: A promises B his nephew, a reward of 500 if he refrained from smoking for two years. B does so. Issue: Is he entitled to the reward? Decision: