This NIJ Research Forum is the second of three volumes presenting the plenary papers delivered at the 1999 Conference on Criminal Justice Research and Evaluation. The papers on school violence prevention included in volume 2 demonstrate that policy grounded in research promises to be most effective if it draws on expertise in a range of disciplines. Sociologist Joseph F. Sheley writes that violence among youths occurs less often in schools than in the communities where students live and that the prime motive for carrying weapons is fear; Ron Prinz offers the insights of psychology, arguing that prevention must be considered from a developmental perspective; and public health psychiatrist Sheppard Kellam demonstrates the need for community involvement in prevention program design.