I've always been under the impression that PBL = case-based learning. Different names for the same thing? (death cab for cutie anyone?
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I'm going to try to way oversimplify Cornell's unnecessarily confusing system. At Cornell, the curriculum is divided into 7 "blocks." Block 6 is clinics in the third and fourth year, and Block 7 is divided into several sections (7a, b, etc) and runs concurrently with blocks 1-5 during your first 2.5 years (until you enter clinics during third year). So basically, the didactic portion of the curriculum is pretty much blocks 1-5 (oversimplifying a little bit, but bear with me).
Block 1 = anatomy, histology, radiology, embryology
Block 2 = cell biology & genetics, including some intro pathology, intro immunology, cancer, etc. stuff
Block 3 = physiology
Block 4 = virology, bacteriology, immunology (for real this time)
(concurrent lecture-based parasitology)
Block 5 = animal health & diseases
Basically, PBL is used in every block except block 2, which is pretty much entirely lecture-based. Parasitology is also lecture-based and is taught concurrently with block 4. Within each PBL block, there are some more traditional things such as lectures, structured laboratories, etc., the extent depends on the individual block. So you're not really completely "on your own," because those lectures and labs serve to sort of guide and structure your independent case-based learning. The case-based stuff happens in what Cornell calls "tutor group" - 6-7 students plus one faculty member. You read through (real) cases that have been specifically structured to present specific "learning issues" (things you don't know and need to go home and figure out before the next tutor group session, at which time your group will talk about the learning issues to make sure everyone's on the same page). Tutor group usually happens about 3 times a week, and you spend 2-4 tutor group sessions per case. That's the simplest way to describe it.
The blocks don't necessarily line up with the beginning and end of semesters. Block 2 started halfway through fall semester, and ends this coming week. Block 3 spans spring of first year and beginning of fall of second year. If you're not completely lost yet, you can take a look at this schematic of Cornell's curriculum:
http://www.vet.cornell.edu/registrar/Years.cfm You'll probably be completely lost after that.
(PS. "Distribution courses" means 6-8 weeks of electives, in between "blocks." No "blocks" are going on during distributions.)
I think Cornell is a lot heavier on the PBL than schools like LSU, Illinois, OR, etc but based on what I've heard, not as heavy on the PBL as Western is. I went in expecting to hate PBL, and while I don't love it it's not terrible. Most people seem to really enjoy Cornell's curriculum.