3 interviews - behavioural, structured case and unstructured case. Each time the case is different and in the behavioural questions they ask about 4, after going over your CV. Mostly friendly.
Interview questions [1]
Question 1
Tell me about a time you had to manage a long term project
I applied through an employee referral. I interviewed at ZS Associates
Interview
I found all the interviewers very friendly and passionate about their work with ZS Video interviews, 2 case interviews, behavioral fit interview and then interview with the office partner/managing principal. Offer shortly afterward. Very much enjoyed the experience.