This monograph examines issues of school safety, focusing on the prevention/early intervention end of the continuum of services and on elementary and middle-school age children and youth. It highlights preventive measures schools can take to implement a proactive school-wide system of discipline to ensure school safety. Emphasis is on creating capacity within schools to respond to the full continuum of challenges, from minor repeated noncompliance to repeated physical confrontations. The five chapters that comprise the booklet are: (1) "Developing Positive School-Wide Discipline Systems" (Teri Lewis-Palmer); (2) "Extending School-Wide Systems of Support to Nonclassroom Settings" (Linda Garrison-Harrell and Timothy J. Lewis); (3) "Building Effective Systems of Support at the Classroom Level" (Joseph Wehby and Timothy J. Lewis); (4) "Addressing Challenging Behaviors at the Individual Student Level: Functional Behavioral Assessment" (Lee Kern); and (5) "Creating Individual Student Interventions Based on Functional Behavioral Assessment" (Terrance M. Scott). A conclusion identifies five common themes critical to the success of any school-wide plan. (Contains 25 references.) (DB)