After reviewing classic and current conceptions of trait las measured
by questionnaires) and motive las measured by the Thematic Apperceptio
n Test [TAT] or other imaginative verbal behavior), the authors sugges
t that these 2 concepts reflect 2 fundamentally different elements of
personality-conceptually distinct and empirically unrelated. The autho
rs propose that traits and motives interact in the prediction of behav
ior: Traits channel the behavioral expression of motives throughout th
e life course. The authors illustrate this interactive hypothesis in 2
longitudinal studies, focusing on the broad trait of extraversion and
the 2 social motives of affiliation and power. In interaction with ex
traversion, both motives show predicted and replicated relations to in
dependently measured life outcomes in the domains of relationships and
careers. Extraversion facilitates unconflicted motive expression, whe
reas introversion deflects social motives away from their characterist
ic goals and creates difficulties in goal attainment.