Aim 1. To conduct an open evaluation of a social network-based PrEP adherence intervention for TW in Peru. The intervention will be piloted with a group of 10-15 TW recruited from a social network within a single geographic area. Using a dynamic process of implementation, refinement, and re-implementation over a 6-month period, we will assess acceptability and feasibility of specific intervention and evaluation components. Data will be used to finalize the study design, intervention manual, and quantitative assessment tools for the pilot randomized controlled trial.