<p>Just to be clear, there are two different things on the table- double majoring and interdisciplinary degrees. Double majoring is getting degrees in two different disciplines and meeting all the requirements for each, including writing two theses. Interdisciplinary degrees are combining two disciplines into one (usually hyphenated) degree and it only involves writing one thesis. There are some already established interdisciplinary degrees, such as Lit-Theatre and Bio-Chem, and then there are Ad Hoc interdisciplinary degrees, where you combine two disciplines to create your own program with the help and approval of faculty.</p>
<p>I think real double majoring is somewhat rare, though I’m sure there are always a few masochists who attempt it. 
Ad hoc degrees seem to be more common, but if you look at the statistics ( [REED</a> COLLEGE BACCALAUREATE DEGREES BY DEPARTMENT](<a href=“http://www.reed.edu/ir/gradbydept.html]REED”>Baccalaureate Degrees by Department - Institutional Research - Reed College) ), it is still a small percent of the student body.</p>
<p>I’m not trying to say it can’t be done, just trying to help you realize that it sounds a lot easier in theory than in practice, especially before you’ve matriculated. But if that’s what your heart desires, then figure out how to make it happen and go for it.</p>