PhD Graduate Student applicants have rated the interview process at George Mason 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 76.3% positive. This is according to Glassdoor user ratings.
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You will speak with potential advisors and current students regarding fit, skills, research interests, etc. in both casual and formal settings. There are no set questions, just determining the right fit.