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This thesis attempts to critically and comparatively analyse the doctrine of exemption/frustration /force majeure under the United Nations Convention on the Contract for International Sale of Goods (CISG) the UNIDRIOT Principles of International Commercial Contracts (UNIDROIT) and the English Law. The doctrine of exemption/frustration/force majeure is very important in the area of contract and commercial law, it is a doctrine deeply rooted in fairness and allows a party to be excused from performing an obligation in a contract if at the conclusion of the contract an inhibition beyond the foreseeable control of the party happens to render the performance of the contract impossible. However, it is not easy to effectively streamline this doctrine and properly determine its applications. It has been observed in this thesis that, the doctrines of exemption/frustration /force majeure are not exactly the same; this thesis explores in details severally and jointly the various differences and similarities in the interpretations and applications of these impossibility doctrines. For instance, the open and flexible use of words in the definition of this doctrin