When many students are tardy at the secondary level, teachers must continually restart instruction or delay beginning instructional periods throughout the school day. To address the considerable amount of instructional time lost caused by high rates of tardiness, the authors investigated the results of schoolwide intervention to reduce student…

This paper describes the implementation and effects of a behavior management system in eight middle schools, including control schools, in an urban school district. The components of the system included school discipline policy review and revision, computerized behavior tracking, classroom organization and management, and positive reinforcement.…