The phenomenon of trade 'blocs' poses interesting challenges for the international trading system. In a sense the definition of a trade bloc is a function of the perspective from which they are apprehended. This lack of a coherent definition could be attributed to the level and quality of the international consciousness that pertains to the enforcement problems trade blocs pose. This chapter aims to draw and sharpen the focus of attention on the problems of managing trade blocs within the World Trade Organization (WTO) framework. The constitutional structure of a trade bloc varies according to the genre of the trading association, and indeed as between associations. Most commentators are in agreement that trade blocs require management if they are to co-exist peacefully and in the framework of the objectives of the GATT/WTO.