Many health and education practitioners agree that school-based violence prevention services can counteract the negative effects of violence by offering children access to mental health care. The lessons learned at three sites that implemented such programs in various schools are reported here. Although the sample of sites was small and diverse, certain tentative findings, which influence planning, designing, implementing, and sustaining school-based violence prevention programs, are offered. The sites included: (1) E. A. Hawse Center in rural Baker, West Virginia; (2) Baltimore Medical Systems, Inc., in Baltimore, Maryland; and (3) Northeast Valley Health Corporation in San Fernando, California. The report and attached case studies present insights based on each site's understanding of the issues, strategies, obstacles, and solutions involved in providing school-based mental health/violence prevention services. This is not an evaluation of the projects, but is a compilation of lessons learned. In section 1, key features of school-based mental health/violence prevention projects are discussed. Some of these features include the role of community and school context, activities and services that support violence prevention and mental health, and securing adequate space and an appropriate location for services. Section 2 concentrates on program administration with an emphasis on key roles, responsibilities, and relationships. Some of the findings discussed here concentrate on management and organization structure, staff background, mental health care, and coordinating school and mental health practices. Financing, assessment, and accountability are addressed in the next section with emphasis on funding, self assessment, and evidence of success. The last section offers recommendations from the field. Three case studies are included. (RJM)