Round 1 - 45 minute case interview on campus. You're given a calculator in all of the cases so use it. Round 2 - 1 behavioral, 2 cases, a buffet lunch, and 1 more case in the afternoon for the people who they are borderline about. Behavioral is only three questions and takes 15 minutes at the very most, so be prepared with lots of questions. Cases ranged from ones with multiple diagrams that you had to analyze to ones that the interviewer created off the top of his head. Don't eat too much from the buffet so you don't get a food coma - about half of the group of students at my superday interviewing for the BA position had a 4th case after lunch. Extremely organized superday, everyone is polite and leaves you with a positive impression of the firm.