I applied online. The process took 1 day. I interviewed at Vanderbilt University (Nashville, TN) in Jan 2012
Interview
Day long process with many interviewees attending at one time. Individually interview with at least 4 faculty members one-on-one. Also, sit through presentations about the institution and programs. Socials are also incorporated into the day with lunch and dinner served.
Interview questions [1]
Question 1
What research have you done already? Why do you want to come to graduate school? What are your interests?
The faculty member I interviewed with was the PI that I applied to work with. The interview was very informal. I talked about myself, my research interests, and past experiences and skills.
After initial application, students are notified of on campus interviews. Students on site will interview with a number of professors personally or in groups, and can request specific interviews while there. Number of interviews ranges from 2-6
Interview questions [1]
Question 1
"Getting to know you" type interviews with professors, wanting to know your research interests and if you fit with their lab. Research their lab ahead of time