Despite the increasing importance of coalitions in public health, few models exist to evaluate the effectiveness of coalitions. In 2008, the Centers for Disease Control and Prevention’s (CDC) Division of STD Prevention (DSTDP), in collaboration with Partnership for Prevention, established the National Chlamydia Coalition (NCC). The goal of the NCC is to reduce the rates of Chlamydia and its sequelae among sexually active adolescents and young adults. The NCC is comprised of over 59 national organizations representing the medical community, advocacy groups, and local, state, and federal government agencies working to improve the health of women and adolescents. Evaluating the effectiveness of the NCC, internal operations, impact and outcomes will result in valuable information for all stakeholders and the field of coalition evaluation in general. This presentation will cover the following evaluation components: coalition logic model; methods; and impact and outcomes of coalition activities on CDC/DSTDP and coalition members.#HealthEvaluation #2011Conference #DiversityandInclusion #GovernmentEvaluation #Collaborative,ParticipatoryandEmpowermentEval