<p>I know the option is available to you, but I was wondering how many students actually do it.
Any estimate would be greatly appreciated.</p>
<p>I can't give you an estimate, but from my research, I'd probably say not too many. I know the Business School's classes aren't open to any undergraduates. But for the other graduate classes in the sciences/engineering, quite a few prerequisities are needed before being allowed to take them.</p>
<p>It's hard to know what is meant by "graduate classes" because many Harvard courses are open to both undergraduate and graduate students.</p>
<p>i second marite. i took ec1410 last semester, which was also offered as a k school class [under a different course number], and was taught by an hbs proof. I think it came out to about 50/50 undergrad v grad.</p>
<p>while you can theoretically take grad classes as an undergrad if your crazy smart, all realistic ones are also given a college course number so technically aren't 'graduate courses'</p>
<p>There must be some subset of math majors who are taking "graduate level" (in Harvard's terms) math courses by the time they are seniors, or even juniors. And some of Harvard's best math courses are close to being "graduate level" in the curriculum of other schools, even if Harvard designates them as undergraduate courses in terms of Harvard's curriculum.</p>
<p>Some of my friends are planning on taking a law school class this year (I think Nesson's evidence one). I know a lot of people take KSG classes. Although I've heard HBS classes are off-limits (sort of makes sense based on their cohort system), there are a few that are cross-listed with FAS. HMS would be sort of a pain, since it's a 20-30 min. shuttle ride away.</p>
<p>But within FAS, like some previous posters have mentioned, the grad/undergrad line is very blurry.</p>
<p>Also, a number of freshman seminars are taught by grad school faculty + meet at a grad school (my freshman seminar Law of the Internet, for example).</p>