The book traces the history of psychological research methodology from the nineteenth century to the emergence of currently favored styles of research. Professor Danziger considers methodology as a kind of social practice rather than being simply a matter of technique. Therefore his historical analysis is primarily concerned with such topics as the development of the social structure of the research relationship between experimenters and their subjects, as well as the role of methodology in the relationship of investigators to each other and to a wider social context. Another major theme addresses the relationship between the social practice of research and the nature of the product that is the outcome of this practice.