There have been many studies published concerning predictors of academic performance but few of these studies have examined the impact of prerequisites. As such, we investigated the impact of a prerequisite management course on graduate student performance in an Organizational Behavior (OB) course. In this longitudinal study, we explored predictors of performance in a Master of Business Administration (MBA) Organizational Behavior course. In particular, we found that the grade received in the prerequisite was positively related to subsequent performance in the Organizational Behavior course. In addition, mode of instruction (online versus on campus) was significantly and negatively related to the grade received in Organizational Behavior. (Contains 2 tables.)