The purpose of www.whatworksforwomen.org is to compile and summarize the base of evidence to support successful interventions in HIV programming for women and girls. National AIDS programs, government ministries, implementing partners, donors, civil society groups and others need an easy-to-understand format for identifying what works for women. This review contains findings from evaluated interventions in 90 countries with a focus on developing countries and contains approximately 2000 references for programming related to the continuum of HIV and AIDS; from prevention to treatment, care and support, and strengthening the enabling environment for policies and programming. In all, the evidence for What Works and Promising interventions includes 455 studies. While this review covers many aspects of HIV/AIDS programming that are relevant for both women and men, it is not intended to be an exhaustive review of all HIV/AIDS programming. Instead, the review focuses on interventions that have an effect on HIV outcomes for women and girls; documenting practices for which there is evidence of successful approaches.