Peter Davies is a lecturer in Sociology at Essex University. He is principal Investigator of Project SIGMA. He is editor (with Peter Aggleton and GrahamHarl) of AIDS: Social Representations, Social Practices (Folmer, 1989), AIDS: individual, Cultural and Policy Dimensions (Folmer, 1990), AIDS: Responses, interventions and Care (Folmer, 1991) and AIDS: Rights, Risk and Reason(Falmer, 1992). Ford Hickson is a senior research fellow with Project SIGMA. He is the compiler of the Directory of Lesbian and Gay Studies in the Uk. Peter Weatherbum is a senior research fellow with Project SIGMA. His main research interests include evaluation and monitoring of behavioral interventionfor HIV prevention and the effects of alcohol and other psycho-active drugs on HIV risk behavior. Andrew Hunt was a senior research fellow with Project SIGMA, from its initial funding until his death in December 1992. He was interested in all aspects of HIV research in relation to gay men.