The HR folks are very friendly, and they help direct you to your interview locations. I went through 2 panel interviews lasting about 30 minutes and 1 group business case preparation and presentation lasting about 1 hour. Each panel interview contained 3 Director or higher-level interviewers. Everyone was friendly. The questions were mostly behavioral questions, with some follow up questions to my answers. It doesn't hurt to take a second to think about the questions before giving an answer. I think they liked that.