I had a back-to-back phone interview with two people. The first was a case interview and the second was a behavioral interview. Each interview took half an hour each. Following the phone interview I was called in for a day long on-site interview at Boston. We had a group discuss with three other interviewees. This was followed by two one-on-one interviews with partners and principals. One was a case interview which was moderately difficult with very little number crunching. The second was a fit interview. I did not get an offer.