In response to the lack of systematic theory in the field of minority-group relations, Dr. Blalock has attempted to present general theoretical propositions based on empirical data in this area. Using power relationships as the integrating theoretical framework, he focuses primarily on competition, status, and economic factors that relate to discrimination. While most of the empirical data cited refer to the case of the Negro in the United States, propositions have been stated in such a way that they may be tested in connection with other minority groups. The book can be viewed as a "case study" of theory building in a substantive field that cuts across a number of social sciences, including sociology, psychology, anthropology, and political science. Therefore, considerable attention is given to the major methodological problems, the testability and evaluation of alternative theories, measurement, and nonlinear and nonadditive models. Because minority-group relations is a major social problem as well as an important theoretical question, an attempt is made to state practical implications on the basis of the theory.