Urban policics in dweloping countries are subject to both internal and external determinants. As elsrwhere, internal determinants, social relations and conflicts evolve over urbun space. external determinants are not only related to the general mechanisms of dependency, but also to specific modes of intervention by European and North American countries: such as consultancy firms producing urban studies and plans, lateral cooperative organisms, international institutions, suppliers of key materials for urbanization (cars. buses, pipes), training centres for planners and other technicians, etc. All urban policies in the Third World have this international dimension. It has been said that urban sociology has become the sociology of urban policies. In this case, urban sociology of the Third World has become that of the sociology of urban po1icies in their international dimensions, and it can only be done by examining each end of the chain, each side of the system of relations. Neither side can be studied without the. other in understanding and analysing the phenomenon which links them. The urban sociology of the Third World could provide the opportunity to reconsider from new points or departure, the relations between European or North American roeiologists on the anc hand, and Latin American or African sociologists on the other.