It was a series of interviews with different supervisors. Some supervisors asked me to send something that showed my writing skills. I received a letter notifying me that I was not chosen.

You are sat in a small conference room and will likely interview with 2-3 different people, depending on the number of positions available. You stay put and the interviewers rotate rooms every 30 minutes. Like speed dating for the corporate world. It seems to mostly be focused on finding out if your personality would be a good fit in their group.