A questionnaire for the measurement of McClelland's concept of achievement motivation is presented. The scale was derived by factor analysis and shows that most of the components of achievement motivation are loaded on a single factor. Norms for several groups are given. Three criterion groups of successful people scored significantly highly on the scale, namely entrepreneurs, professors and managers. The scale is uncorrelated with neuroticism or extraversion, or with any of Cattell's 16 personality factors with the exception of superego strength and surgency.