The papers focus on ways that neighborhoods, families, and employment opportunities can be strengthened and helped to function in ways that prevent crime. Discussions of national models of success describe four community-based organizations that variously resolve citizen conflicts through mediation, provide extended family environments for youth at high risk of criminality, and perform broad functions related to neighborhood organizing. Further analyses present preliminary evaluation summaries of two national, multisite demonstration programs that, during the 1980's, have tried in modest ways to replicate some of the principles underlying the successful model programs. Additional papers present the views of national and city leaders, officials, and practitioners regarding policy proposals and their own local initiatives. Final papers consider the application of Japanese concepts of community-based policing to a California community and governmental and other initiatives in crime prevention in the United Kingdom. Tables, figures, and footnotes.