This guide is designed for use by school, district, and state staff to improve the effectiveness of efforts to collect and use disciplinary incident data, including reporting accurate and timely incident data to the federal government. It provides recommendations on what types of data to collect, why it is critical to collect such data, and how to implement and manage an incident database. This guide reflects the judgment of experienced data managers; while there is no mandate to follow these principles, the authors hope that the contents will prove a useful reference to others in their work. Chapter 1 focuses on the use of crime, violence, and discipline data to improve school safety. Chapter 2 presents strategies for implementing an incident database, including system design, management, and training. Chapter 3 recommends a body of data elements, definitions, and code lists useful for collecting accurate and comparable data about crime, violence, and discipline. Chapter 4 offers suggestions for the effective presentation and reporting of crime, violence, and discipline data. Appendices include: (1) Federal Reporting Suggestions; (2) References and Additional Resources; and (3) Technical Assistance on Addressing Bullying Through Policy. (Contains 13 tables, 8 figures and 23 footnotes.)