By Kurt Lewin

FROM THE FOREWORD BY DORWIN CARTWRIGHT: “When the intellectual history of the twentieth century is written, Kurt Lewin will surely be counted as one of those few men whose work changed fundamentally the course of social science in its most critical period of development. During his professional life of only about thirty years, the social sciences grew from the stage of speculative system building, through a period of excessive empiricism in which facts were gathered simply for their intrinsic interest, to a more mature development in which empitical data are sought for the significance they can have for systematic theories. Although the social sciences are only barely into this third stage of development, Lewin's work has accelerated greatly the rate of development. Though he was primarily a psychologist and made his major contributions in that field, the influence of his work has extended well beyond the bounds of traditional psychology.

New York. Harper & Brothers Publishers. 1951. 365p.