Awesome process! Great that I've experienced various other interviews prior to my interview with Booz Allen Hamilton. They begin with an over the phone interview and if you pass the basics(knowledge about the company, the position, your own resume topped with a positive ambitious attitude - you should expect an email invitation to the next round).

My session was a group session with interviewees looking to fill various other roles within the company. There is a question and answer group portion(ask at least one genius question) and then you will be individually interviewed by 2-3 employees of the company that will be potentially working with you on the project you are interviewing for.

What do you like to do for fun?