This is an advanced, technical work written by a leading theoretician. McClelland examines motivation in the personality and behaviorist traditions. He focuses on the dimensions of personality which drive behavior: achievement, power, affiliative, and avoidance motives. This work explores motivation in the context of trends in society, cognitive effects, values and skills, and training. Provides an enormous bibliography. This work is a classic and deserves careful reading by anyone deeply interested in the subject of motivation. Highly recommended!