McClelland earned his BA in 1938 at Wesleyan University, his MA in 1939 at the University of Missouri, and his Ph.D. in experimental psychology at Yale University in 1941. McClelland taught at the Connecticut College and Wesleyan University before accepting, in 1956, a position at Harvard University. After his 30-year tenure at Harvard he moved, in 1987, to Boston University, where he was a Distinguished Research Professor of Psychology until his death at the age of 80.
McClelland proposed a content theory of motivation based on Henry Murray's (1938) theory of personality, which sets out a comprehensive model of human needs and motivational processes.1. In McClelland's book The achieving society (1961) he asserts that human motivation comprises three dominant needs: the need for achievement (N-Ach), the need for power (N-Pow) and the need for affiliation (N-Aff). The subjective importance of each need varies from individual to individual and depends also on an individual's cultural background. He also claimed that this motivational complex is an important factor in the social change and evolution of societies. 2. His legacy includes the scoring system which he co-developed for the Thematic Apperception Test (TAT) that was developed by Murray and Morgan (1935). The TAT is used for personality assessment and in achievement motivation research, and described in McClelland, Atkinson, Clark, & Lowell's (1953) book The achievement motive.
McClelland's theory was an attempt to scientifically test Max Weber's Protestant Ethic and the Spirit of Capitalism. One of the key studies, confirming the validity of McClelland's theories, is the study of Bradburn and Berlew (1961) who analyzed achievement motives in British school readers ("text books") and showed a strong correlation of these themes, a generation later, with