Like everyone says, there is a skills test, 2 phone interviews and then an in-office interview. Helpful feedback is quickly provided by the interviewers. Very organized and pleasant process to go through compared to other firms. OW has a slightly different approach to case interviews than other firms, very focused on candidates ability to structure problem, not as concerned with the answer. Best for candidate to be very deliberate in framing answer, and not make too many assumptions without clarifying that you are making them first with interviewer. All in all a pleasant experience with a talented group of people.