The Computing Technologies Research Lab (CTRL) is a software development group within the David Geffen School of Medicine at UCLA serving the biomedical community across the campus. CTRL has developed a related set of OpenACS components that collectively we refer to as Protocol Tracker (pTracker). PTracker consists of three main components: a subject manager, a user interface to the OACS workflow package, and our Surveys application. Below are several case studies that briefly highlight pTracker in medical informatices: