<p>I was a TA in a course that had undergrad, Ph.D. and Med students enrolled (a couple of Residents audited as well from time-to-time). It was cross listed in the departments of behavioral sciences (now psychology) for both the division of social science and biological science, psychiatry, and the college. There was no friction and we had a good time. The undergrads had nearly the same work and held their own quite well. </p>
<p>The College was purposely created without reference to departments. Professor who hold appointments in a department (which exist in reference to the graduate school divisions) do not necessarily hold appointments in the College (and vice versa). The Dean of the College makes those appointments. The idea was to encourage cross discipline collaboration in the College and that persists even today.</p>