Book excerpt: Monograph on development theories of underdevelopment and social theory of social change in developing countries, particularly Latin America - examines sociological coverage of Third World social development issues, obstacles to implementation of ECLAC's economic development policies, imperialism and dependence, social structures and rural area social class relations, political systems, role of the state and armed forces, etc., and describes peasant movements as well as socialist and bourgeois revolutions. Bibliography pp. 164 to 170.