The entire process was a behavioural and case interview. The case interview was not a traditional consulting interview. They give you a package of notes and data and you're given time to analyze it and answer questions. Afterwards you discuss the results with your interviewer. The people are super nice and answer all questions.
I applied through a staffing agency. The process took 4 weeks. I interviewed at ZS Associates (Princeton, NJ) in Mar 2016
Interview
Applie through referral and had a first round fit + case online. I was then called in for a final day interview which consisted of demonstration interview, analytical interview, case, and behavioral.
I applied through college or university. The process took 1 day. I interviewed at ZS Associates (Los Angeles, CA) in Jan 2016
Interview
The process was fairly simple. I came in and did some paper work. I had a one on one with a guy who asked me a bunch of behavioral and situational questions. Then there was a 30 min case study, in which a guy walked me through a case. I thought it went fairly well, but I ended up not getting called back. Nice people though.