I went through several rounds of interviews with several different types of interviewing methodologies.
I had 4 face to face interviews and 2 phone interviews. Each person was looking for role and culture fit. Some focused on skills that were necessary (PPT capabilities) others focused on my ability to fit in with the fast paced consutling lifestyle. Finally, others were just looking to see if I would be able to handle myself successfully in front of clients. For potential interviewees, I would suggest that you know yourself well and be able to speak to your accomplishments (basic, I know, but the questions mostly focused on historical context lifted from my resume). I worked through a recruiter so most of my process was facilitated and managed through her efforts. Overally the process was smooth and efficient, but extensive. The interview process is not for the faint of heart which is intentional, the work we do requires diligence and perseverance.