What do you think of this resource? Please click here to complete a quick survey. This case study examines the use and benefits of online user generated study materials in Medicine. Two medical students from the University of Bristol developed a free, online self-assessment system called Medicles. This website allows medical students from all over the world to develop and share mini-tutorials on a wide range of topic areas. This case study examines how the Medicles system works, and discusses the benefits that user generated learning resources can offer.