There were 3 rounds of interviews - each of the first 2 rounds were case interviews, an he final round was one case interview and one 'fit' interview. I got into the interview process, when BCG did a presentation at my campus, and I talked to the recruiter that was there, afterward. She put me into the process, and then emailed me to schedule the interviews. The first 2 rounds were in the local BCG office, and the last round was a video-conference with the office I had applied to.