This research examined individual differences in action identification level as measured by the Behavior Identification Form. Action identification theory holds that any action can be identified in many ways, ranging from low-level identities that specify how the action is performed to high-level identities that signify why or with what effect the action is performed. People who identify action at a uniformly lower or higher level across many action domains, then, may be characterized in terms of their standing on a broad personality dimension: level of personal agency. High-level agents think about their acts in encompassing terms that incorporate the motives and larger meanings of the action, whereas low-level agents think about their acts in terms of the details or means of action. Research on the convergent, divergent, and predictive validity of this construct examined its implications for the individual's overall competence in action, for the individual's inclination toward planful versus impulsive action and for the degree to which the individual's actions are organized by and reflected in the self-concept. Some people think they can do big things. They set out to write a book, to make a fortune, or to win an election. There are others, however, who may undertake much the same tasks with far more meager aims in mind. They might get some ideas on paper, make a profit this week, or shake a few hands at the factory gate. Ultimately, the people who see their acts in big ways may find the same success as those who focus on the details. However, the two ways of identifying action are appropriate and effective in vastly different situations, and they promote radically distinct styles of action. This research was designed to test the reliability and validity of an instrument assessing this action identification dimension. High levels of personal agency represent the tendency to understand one's action in terms of its consequences and implications, whereas low levels of personal agency represent the tendency to see one's action in terms of its details or mechanics. The dimension of personal agency level is derived from action identification theory, a set of principles on the understanding