I received an interview for an internship because of another application I had submitted for the Women in Technology Consulting Conference. So, my initial screening interview was for the conference, but then a specific office contacted me for an in-person interview for an internship. The office was very good about working with my busy schedule to get me in to meet everyone on the team. I didn't know what to expect for the day, but when I arrived, I met with the recruiter, who told me about the schedule for the day and gave me a tour of the office. He was very laid back and tried to make me feel as calm as possible. I thought I would be in a group of other candidates, but it was just me all day. After the tour, I had two 30-minute interviews with advisory managers. Then, an advisory partner took me and two newer associates to a very nice lunch. After lunch, I had another 30-minute interview and a 30-minute case interview. All interviews were behavioral; they just wanted to get to know me, my personality, and my work style. The case interview was more analytical. I was nervous because I had not prepared for this (not knowing the schedule ahead of time), but I think I did well, and the interviewer told me the same. The analysis was more of a back-and-forth Q&A and conversation rather than me just giving my own thoughts, which made it a little easier. Afterward, I met with the recruiter and the partner. We talked about how the day had gone, and they let me know they would be sending me an offer letter. :)

Applied through campus recruiting; had a 30 min behavioral interview. It involved pretty standard first round questions. The interviewer was pretty casual and easy to talk to, but I think it would be a mistake to mirror the interviewer; even if they act like its a casual conversation, make sure to 'wow' them.