Children are threatened, teased, taunted, and tormented by schoolyard bullies every day in the nation's schools. In a study of junior high and high school students from small Midwestern towns, 88 percent of students reported having observed bullying, and 76.8 percent indicated that they had been a victim of bullying at school. Bullying can interfere with learning and often leads to greater and prolonged violence. Research and experience suggest that comprehensive action involving teachers and other school staff, students, parents, and community members are likely to be more effective than purely classroom-based approaches. Several model violence-prevention programs are described in this manual including that of Norwegian researcher Dan Olweus which is described in detail. Other effective programs are "Expect Respect,""Bully-Proofing Your School,""Respect & Protect,""No Bullying," and "Second Step." Bully prevention guides include "Bullyproof: A Teacher's Guide on Teasing and Bullying for Use with Fourth and Fifth Grade Students,""Quit it! A Teacher's Guide on Teasing and Bullying," and "Bullying," which includes a teacher's guide and video. The manual concludes with a listing of references, bullying videos, and bullying books for children. (RT)