Applied to the London office. They came to our business school, had a number of information sessions and then screened CVs for the first round. Passed the first round of two interviews and then had three interviews with partners for the second round about ten days later. In between doing the second (and final) round and getting dinged I got two congratulations e-mails from BCG, one from a 'buddy' who was assigned to me to convince me to join and one from the lead recruiter at our school. Naturally it was very confusing when I got the ding phone call. They promised to call me later with feedback on my interviews, but never did.