The purpose of this paper is to explore further some remarks of Professor Treitel, in his Law of Contract, in relation to the extent to which a foreseen or foreseeable event may preclude the operation of the doctrine of frustration and to offer an alternative role to foresight than is suggested by Trietel's analysis. A consideration of foresight is of more than passing interest since it touches upon the foundation of the doctrine, the object of which, it is said, is ‘to find a satisfactory way of allocating the risk of supervening events.’