Missed instruction can have a devastating impact on educational outcomes. Some reasons for missed instruction are beyond the control of schools and districts: some students miss school due to mental or physical illness or injury, and transportation problems sometimes are to blame. One major reason for missed instruction that schools can directly influence is the decision school administrators make to suspend students, as well as the length of suspensions. As this report will demonstrate, numerous schools in the Commonwealth regularly remove a high number of students, culminating in large amount of lost instruction time. The purpose of this report is to encourage systemic reform, and it serves as a call to use discipline data in evaluating Massachusetts' schools. This descriptive report is intended to influence administrative policymakers in Massachusetts who are currently working with stakeholders across the state to develop school performance indicators for use in the state's accountability system.