I applied online. The process took 1 week. I interviewed at Boston University (Boston, MA) in Jan 2015
Interview
Applied via the online portal from BU site, followed by in person interview where they discussed my core competencies to decide which ongoing research project that I might be a good fit for based on my profile and skills
Individual faculty interviews with principal investigators where they ask you questions based on your experience and their own background. They try to match based on which program you want to join. Current students facilitate getting you to and from each interview.
Interview questions [1]
Question 1
Describe undergraduate research challenges and how you overcame them
Submit the application through the system, and waiting for the response. After the interview, you will get the result soon. It would be better if you could get a referral from your friend or classmates.