Self-explanatory; why do you want a PhD? Most, if not all, interviewers ask this question and I'm wondering what kind of responses you guys give (and also what your real reasons are). Is it an actual burning passion for research? Do you just want to keep your student VISA? Are you afraid to enter into industry, maybe because of the economy or weak programming skills or insecurity, for example? Are you doing it because it seems like everyone else is? Do you feel you have to prove yourself, that PhDs are what smart people do or are you still under the yoke of feeling pressured to perform well in a school? Do you feel safest in the academic environment? Are you rich and you want to do it just because? Just curious what everybody's reasons are. I have a hard time believing that so many students fresh out of college would be going for PhDs purely because they are passionate about research in a certain field; this is a relatively new trend so there have got to be other reasons. We all know that a PhD in computer science isn't really necessary for most of us, and in most cases will box us in in terms of career choices in the future. So why are you doing it?
For me, I'd say 70% of the reason is I actually want to do research; the rest is a combination between all of my friends are doing it and I'm afraid of the economy, which is irrational, since I'd probably make more in industry, period. Anybody else?