There were three stages. First I had a phone "interview" with a computer system. It was very short and asked basic questions about background. Second I had an online, Skype-style interview that took about an hour. They asked some questions about charts, looking for whether you could spot data that didn't make sense, or try to analyze trends. Finally, I had a half-day in-person interview at the Northbrook headquarters. I met briefly in a casual way with three younger actuaries still working on exams, and had longer more formal meetings with three more senior employees. The interviews were not generally too difficult or scary, though I found some of the questions they asked to be so broad that I wasn't sure what kind of answers to give (e.g. "tell me about a time that things didn't go how you planned.")