One of the key constituents of a contract. An agreement is only enforceable if, inter alia, there is an intention that it should be legally binding. As a general rule, the law presumes that familial and social agreements are not intended to be binding (Balfour v Balfour  2 KB 571). The reverse presumption, i.e. that there is an intention to be bound, applies in agreements of a commercial nature (Edwards v Skyway Ltd  1 All ER 4). Both of the above presumptions can be rebutted by bringing forth evidence to the contrary (Merritt v Merritt  1 WLR 1211).