Project SIGMA's research on gay men's sexual behaviour and Aids and HI
V infection has posed complex ethnographic and methodological problems
which have required unorthodox and innovative strategies for their so
lution. Three main problem areas included: value-conflict between inte
rviewer/HIV tester roles; Issues concerning data confidentiality and l
egal interference, and the elicitation of detailed sexual behaviour. T
he procedures developed have clear applicability to other research con
cerned with covert, stigmatised and legally-sensitive behaviour or dat
a.