The interview consisted of an hour long phone interview and then they invite you to Omaha for a personal interview if they like you. The questions comprise of simple case studies, technical aspects of financial modeling, power industry and finally behavioral aspects. The interview seemed relatively simple and straightforward. I would like to comment on the way interviews were conducted over meals. These are not meet and greet, they are formal interviews (case studies and questions on career) while you have food in your mouth. So I would suggest eat and go before the meal. Also the interviewers seemed inexperienced and did not know what to evaluate or how. This in my opinion reflected on the quality of people.