You need to apply online to submit your Personal Statement, Resume, transcripts, and everything you think that might be helpful for you application. Then you will be arranged an interview by several PIs and a student to record. After the interview, if you are admitted, you will be contacted.
Talked to several of the faculty and went on tours of campus. Had to discuss both past research and future goals. Nothing too crazy. It lasted the whole weekend Thursday through Sunday.
Interview questions [1]
Question 1
What have you worked on in the past?
What do imagine you want to study in the future?
The interview process was very good. The professors were forthcoming with what they expected in a candidate and encouraged them to find a good fit.
I benefitted greatly from the experience.