Contents: I. Karl Marx's Model of the Class Society; II. Changes in the Structure of Industrial Societies Since Marx; III. Some Recent Theories of Class Conflict in Modern Societies; IV. A Sociological Critique of Marx; V. Social Structure, Group Interests, and Conflict Groups; VI. Conflict Groups, Group Conflicts, and Social Change; VII. Classes in Post-Capitalist Society (I): Industrial Conflict; VIII. Classes in Post-Capitalist Society (II): Political Conflict.