As Davis and Harden (1999) have indicated there is still some confusion about what PBL really is. It is best thought of as an educational approach where students are encouraged to take an active role in their learning by discussing a problem (or scenario) centred on a clinical situation, community problem or current scientific debate. In the clinical context this might be a description of events when a patient attends a GP surgery or A & E department. The history, presenting complaint, signs and symptoms, ethical issues, investigations needed (and their outcomes) can all be woven into the case as required. The problem has to be written so that the students can identify the areas that they need to explore in order to be able to resolve satisfactorily gaps in their knowledge and understanding that become apparent during group discussion.