First round: a deductive reasoning test and panel discussion / case studies. The outcome of this interview is determined solely by the deductive reasoning test. Second round: a series of three 1:1 interviews, all involving an Experience question and a Case interview question. I found the case interview questions to be very similar to the case studies in Round 1, except that the pressure to perform is higher since it's 1:1. I found the Experience questions to be the most challenging aspect - if you don't have the right kind of story under your belt, then it's very difficult to formulate the kind of answer that they want to hear. This is particularly difficult in for PhD recruits. Example: one of the Experience interview questions essentially required me to describe a situation where I resolved a personality conflict in the work environment. I've been fortunate enough never to be put in that position, and so while I discussed a situation where I resolved a professional difference of opinion, there was no personality conflict, so I really didn't answer the question that the recruiter asked. I think my interview really suffered for that.