The interview will take place in 3 rounds : Round 1: Case study (30 minutes) followed by discussion(45 mins.) on it - Consultant/Manager Round 2: Guesstimates,puzzles,general aptitude and grilling on resume - Manager Round 3: Stress Interview - Manager Round 4: General questions by a Principal Round 1 will be the basic case interview round where you are given a case study depending on the profile you choose ( out of Business Analyst/Operations/Technology) followed by a detailed discussion where you will be justifying your recommendations. Round 2 & 3 can be merged as well depending on the situation. For me, it was one long round where I was asked 2-3 puzzles and 3 guesstimates. I then had to defend my resume. It was followed by a stress interview where the manager tries to get into your head by saying that you are a very average person and that your resume is simple textbook. You need to keep your head straight in this round- the purpose of this round is to judge how you deal with the situation under pressure. Try putting up a smile and do not panic. Round 4 depends on how much the team is impressed by you. I was not required to appear for this round as I they seemed pretty happy with me.