For a summer intern position, the first round consisted of two 45-minute interviews that involved a few behavioral questions and a case. The questions were pretty standard -- walk me through your resume -- and the case didn't involve anything too difficult. It was almost like a formality; they had already picked their top candidates and they just wanted to see them in person. I haven't been called back for round two, but I haven't been denied yet, either. They have called a few to bring them in again.