Aim 3. Conduct an RCT to evaluate whether an HIV testing intervention, designed to match the testing preferences of two high-risk populations, increases testing uptake relative to a default option. Hypothesis: A preference-based HCT intervention increases the uptake of testing. Representative samples of 600 female barworkers and 600 male mountain porters will be randomized into two groups. Group A participants will be offered the set of predicted more-preferred PB-HCT options identified in Aim 2 and a default option; Group B participants will be offered an equal number of predicted less-preferred options and the default option. Uptake of testing and the cost-effectiveness of PB-HCT will be assessed at 6 and 12 months.