As the organizational literature on specific proactive behaviors grows, researchers have noted inefficiencies and redundancies in the separate study of different proactive behaviors when their underlying nature, antecedents, processes, and consequences may be similar. We develop a framework designed to generalize across specific manifestations of proactivity, describing the nature, dimensions, situational antecedents, psychological mechanisms, dispositional moderators, and consequences of proactive behavior. We conclude by discussing implications and recommendations for organizational scholars to take a more proactive approach to constructing, evaluating, and cumulating theory about proactive behavior. Our chapter thus answers recent calls for integrative theory about the general dynamics of proactivity, and fits with current trends emphasizing the increasing importance of proactivity in organizational life.