Through this formative evaluation, researchers sought to provide foundational knowledge of the law enforcement-based victim services programs funded through the Office for Victims of Crime Law Enforcement-based Victim Services (LEV) program and move the victim services field closer to being able to evaluate the effectiveness of LE-based victim services and identify best practices for service provision. The researchers' specific objectives were to (1) develop a comprehensive inventory and typology of all LEV programs, (2) develop logic models and identify core components of a subset of sites, (3) conduct an evaluability assessment in the subset of sites, (4) develop recommendations for future outcome evaluation, and (5) develop an implementation guide and fidelity measures. The data archived here include administrative data on LEV programs provided by the Training and Technical Assistance (TTA) team, a web survey of all LEV sites, and Census data that was used to describe the communities in which LEV programs were located.