N the late 1930s, S. S. Stevens (1936Stevens ( , 1939 excitedly heralded the birth of a new discipline, an interweaving of psychology and the philosophy of science, which he termed the "science of science." Claiming that psychology was "propaedeutic" to all other sciences in the sense that it could investigate general laws governing scientific behaviors, Stevens saw in the vigorous new philosophic doctrines of operationism and logical positivism a thrust toward an explicit psychological analysis of science.Some 30 years have passed, and we do not as yet have a developed, self-conscious discipline of a science of science. 3 We are now, however, in a better position to anticipate its arrival. Psychology has accomplished a great deal since Stevens' articles, and much of what it has accomplished bears on an analysis of the scientific process; and in fact many researchers have made such extrapolations. At Alberta, Royce (in press) has begun a research program in epistemology, the first to be conceived explicitly within a discipline of psychology of science. On philosophy's side, every major work of the past decade in epistemology and philosophy of science has been written more or less from a psychological viewpoint. Three recent books by psychologists, Turner's (1967) Philosophy and the Science of Behavior, Maslow's (1966) The Psychology of Science, and Royce and Rozeboom's (in press) On the Psychology 0} Knowing, further testify to the wedding (remarriage?) of the two disciplines.This article briefly presents the major areas of interaction between psychology, science, and philos-1 The author is grateful to Merle Turner and Raphael Danscn for their comments on an earlier draft of this article.2 Requests for reprints should he sent to Barry F. Singer, Psychology Department, California State College at Long Beach, Long Beach, California 90801.3 Other expressions, such as "behavioral science of science," "psychology of knowledge," "social science of science," and "metascience," have also been used to refer to the same concepts. Maslow's term "psychology of science" will be adopted here as being relatively brief and descriptive.