Participants from Australia to Zambiaattended the HIV prevention works, an official satellitesymposium of the Eleventh International Conference on AIDS,held on July 6, 1996 in Vancouver, British Columbia. Thesymposium highlighted what works in HIV prevention, whysound HIV prevention programs and policies are publicinvestments, and where attention should be directed in thefuture. This brief encapsulates the lessons learned andrecommendations, which, a year later, have not lost theirvalidity or relevance. The symposium was designed to profileinternational best practices, including models of successfulHIV/AIDS prevention programs and policies, and to share anddeepen knowledge about those programs and policies.Presentations were made on preventing HIV infection,consequences and conditions of risk, working withindividuals and families, working with communities, workingwith organizational and societal change, and research forprevention evaluation.