Empirical evidence on the conceptual and construct validity of the motivational trait taxonomy proposed by Kanfer and Heggestad is presented. 228 adults completed a shortened form of the Motivational Trait Questionnaire (MTQ), along with a battery of personality and ability measures. Relationships of the MTQ with personality measures show evidence of convergent and discriminant validity for trait constructs of Personal Mastery, Competitive Excellence, and Motivation Related to Anxiety. In addition, MTQ scale scores were generally unrelated to composite measures of fluid and crystallized intelligence. Examination of age differences showed a pattern of developmental decline in the achievement trait complex, but not the anxiety complex.