There is a longstanding and pressing challenge regarding overuse of exclusionary discipline (e.g., office discipline referrals, suspensions) for students of color and students with disabilities. Moreover, many common efforts to address the problem have not been shown to enhance equity in school discipline. This article describes a promising four-step approach, described in the freely available PBIS Disproportionality Data Guide, for using school discipline data to identify specific interactions that are more susceptible to the effects of implicit bias on decision making and change the environment to meet the needs of all students. A case study is included that identified disproportionality for physical aggression on the playground as a primary source of overall disproportionality and implemented a plan that included elements of explicit instruction and cultural responsiveness. Results showed a consistent decrease in discipline disproportionality over time.