Undergraduate Student Interview applicants have rated the interview process at Princeton University with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 70% positive. This is according to Glassdoor user ratings.
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I interviewed at Princeton University (Boston, MA) in Feb 2011
Interview
Interviewing for Princeton in an opportunity for the applicant to demonstrate there is a personality behind the application. It's an opportunity to support the things you've mentioned in the CommonApp, but it's important not to reiterate everything you've already written.
Interview questions [1]
Question 1
My interviewer did not initially ask any questions and left it open for me to speak about myself. So preparing a little spiel about why you're an ideal applicant might be useful. Otherwise college interviewers might want to hear about how you think as a student, how you spend your free time etc...