This booklet contains conference presentations from the 1999 National Institute of Justice's research forum on preventing school violence. The theme of the conference was "Enhancing Policy and Practice through Research." Three researchers were asked to speak on topics of school violence since effective preventive policy and practices are increasingly needed. The three speakers demonstrated the concept that policy grounded in research promises to be most effective when it draws on a range of disciplines. Sheppard G. Kellan, public health psychiatrist, discussed the importance of community involvement in designing prevention programs. Ron Prinz, psychology professor, offers insights of psychology and the importance of considering developmental perspective in prevention. Joseph Sheley, sociologist, looks at weapons carrying by youth and the ways schools have lowered weapons-related incidents. (Contains 91 notes and 4 tables.) (JDM)