This reference manual identifies five overarching sets of activities for improving school climate, with the goal of improving student outcomes (e.g., achievement, attendance, behaviors, and skills). These sets of activities help to initiate, implement, and sustain school climate improvements. For each activity set, the manual presents a clear purpose and set of activities that can help schools and districts develop an infrastructure to promote and sustain their efforts. They are: (1) Planning for School Climate Improvements; (2) Engaging Stakeholders in School Climate Improvements; (3) Collecting and Reporting School Climate Data; (4) Choosing and Implementing School Climate Interventions; and (5) Monitoring and Evaluating School Climate Improvements. This manual provides comprehensive strategies to implement school climate improvements.