ATSU-Mesa will be using something similar to PBL. Its called the clinical presentation model (developed in Calgary, Canada), which proposes that there are exactly 125 ways that patients present to doctors (i.e. patient presents with cough, or headache, etc.). You go through all the presentations, starting as a large group, facilitated by a faculty member, then spilt up into smaller groups. It's not pure lecture or PBL, but has some elements of both. It's not split up into traditional subjects such as physiology, biochemistry, etc. and gives you a clinical context like PBL.