Hardly anything in psychology is as irking as the trait concept. Psychologists and laypersons alike use primarily adjective trait-names to characterize and even concep­ tualize the individuals they encounter. There are more than a hundred well-defined personality traits and a great many questionnaires for their assessment, some of which are designed to assess the same or very similar traits. Little is known about their ontogenetic development and even less about their underlying dynamics. Psy­ choanalytic theory was invoked for explaining the psychodynamics underlying a few personality traits without, however, presenting sufficient empirical evidence for the validity of these interpretations. In a reductionistic vein, behaviorally inclined psy­