This report focuses on cross-site evaluation in terms of the cross-site data collection and analysis efforts of the Collaborative Program to Prevent Homelessness (CPPH), an initiative designed to document and evaluate effective homelessness prevention strategies for adults who are formerly homeless or at risk for becoming homeless. The purpose of this report is to describe both the process used for developing the shared methods and measures that comprise the cross-site portion of the program and to summarize the key findings. It is organized into four chapters. Chapter I Provides an overview of the interventions that made up the CPPH, the evolving CMHS/CSAT approach to cross-site evaluations and the organizational structure of the cross-site initiative. Chapter II describes the cross-site methods including the evaluation design, similarities, and differences among the interventions, key outcome domains, instrument development, data collection, and management procedures, as well as the development and application of the cross-site analytic framework. Chapter III describes the key findings and Chapter IV discusses their significance and limitations, as well as recommendations and lessons learned. (Authors)