A Systematic lucid presentation to Sociology, development and underdevelopment, embracing the investigation of social change from agrarian to industrial societies and particularly applied to the study of the Third World, suitable for university education. It covers the major syllabus at this international level, and is specially manifest, interesting and readable through. The essential areas are covered in terms of the major Theoretical, Scientific and mathematical perspectives within a complete range of sociology. Each chapter closes with a section on the system of ideas, underlying and informing social and political action, opined. A criticism is maintained throughout. It reflects globalized changes, and at the same time affirms, and hopefully explicates, its relevance to present neo-events.