This book is a reflection of a growing awareness among philosophers and psychologists of the inescapable entanglement of psychology with its philosophical underpinnings. It deals with the dissection of the assumptions that control contemporary inquiry into psychological events, and it offers a preliminary examination of the consequences for understanding behavior that different assumptions provide. The broad scope of topics provides a number of bases from which to view problems and questions bearing on the philosophy of science for psychology. Pronko examines how guiding postulates determine the outcome of inquiry, raises new questions and new possibilities regarding old problems, and stresses the importance of seeing known facts in a new light and describing new theories.