I interviewed there last application cycle, I declined admission to go to Stony Brook, but from what I recall there was an info session. Then there was a writing portion some short answers then an essay. Followed by either a tour or group interviews. From what I remember the questions for the short answer and interview were very normal interview questions, why pt, when was a time you showed leadership, when there was a stressful situation how did you handle it, that kind of stuff. Overall, I'd say it wasn't very intimidating, just be yourself, you got through to the interviews so you know that you're good enough to be in the program already. As for my opinion on the program, I wasn't very into their problem based learning model and nothing really screamed choose chatham to me so I went elsewhere, hopefully you have a better experience than me though!