<p>Each university labels its courses differently. I suspect that some of the courses that H labels as “primarily for undergraduates and graduate students” would be labelled at Princeton or Chicago as advanced undergraduate courses. I do believe, however, that up to half the students in some of my S’s courses were graduate students.</p>
<p>Ya, Harvard is really pretty lax about its labeling, though it varies by department. For instance, the math department is really structured and labeled. The 100’s are for undergraduates and the 200’s are for graduate students. Though that breaks down when you realize that a handful or so of sophomores take 200 level classes. However, in the philosophy department, the majority of classes are 100 level courses, and are made up of a mixture of undergraduates and graduate students. There are a handful of “graduate only” seminars, but I’m told undergraduates are often allowed into them. The main point is that Harvard has a somewhat unique situation in which they have alot of top graduate students and undergraduate students of similar levels. So instead of making alot of artificial barriers, they just have you take the course that meets your ability level, whether it’s a “undergraduate” or “graduate” course.</p>