This book of psychology is written by two psychologists for managers and students of management. It consists of a two-pronged approach. First, it analyzes the work of psychologists who have adopted a scientific perspective. In management, this means treating people as predictable objects. Second, it offers an alternative to scientific psychology that treats people as purposive subjects. The purpose of this psychology is as a psychology of self-determination, to enable working people to gain insight into and mastery of themselves. To achieve this requires new foundations for managerial psychology based on purpose, choice, freedom, and responsibility. This book is an attempt to clarify certain ideas about managerial psychology and to suggest a new direction.