Can a homelessness prevention program run by a network of neighborhood-based organizations keep at-risk families out of shelter and will the cost of the prevention services be offset by savings resulting from reducing shelter expenses? These are the questions that this study of New York City’s Homebase Community Prevention (CP) program answers through a random assignment evaluation. The study also explored the possible effects of  CP on two of the city’s collateral municipal systems that provide child welfare and income assistance services.  The study was conducted by Abt’s Howard Rolston, Ph.D., Gretchen Locke, MA, and Judy Geyer, Ph.D. in partnership with Steve Metraux and Dan Treglia of the University of the Sciences.