The current research examined behavior prediction of implicit and explicit measures of personality. Specifically, I examined the role of cognitive load and information processing in the prediction of behavior by implicit and explicit self-concept personality measures. Undergraduate students, N=83, completed self-report (explicit) and Implicit Association Test (implicit) measures of two Big Five factors (extraversion and conscientiousness), and their personality-relevant behaviors were coded in multiple work-related tasks, including video-recorded telephone interviews. Participants completed all tasks in single-task and dual-task conditions. Results did not provide support for a dual process model of personality self-concept which posits that implicit measures are better predictors of behavior under conditions of cognitive load, and self-report measures are better predictors of behavior under conditions of low cognitive load. The limitations of the current study are discussed. Overall, the results did provide some evidence of the validity of implicit measures in the personality domain.