triangulation. After each clinical session, the physician was required to file a form documenting whether HIV prevention was delivered according to the protocol and recording the length of time spent discussing HIV prevention with clients. In an exit survey, each patient was interviewed by a research staff member and was asked the same questions. In this way, each patient’s report provided a cross-validation of the physician’s report on the intervention fidelity. The data from both sources indicated that the services were delivered in the majority of the treatment sessions.