Only one round of three 30 minute interviews back-to-back. Interviewers were within consulting, but were not from the office I was interviewing for. Were rather informal, although they varied. A very enjoyable process, if a little strange for consulting.

Mostly behavioral, multi round, make sure you prep on the company itself and make an effort to be positive and passionate as they value their company culture highly. I would also make sure to know your role details very well and how you could contribute to the company.