They bring you in to talk to your hiring supervisor. If they feel you are a good candidate they'll bring you in for another interview to meet with the whole department. The first interview is quite brief while the group interview is quite lengthy. Every member of the department is able to ask questions.

Phone interview followed by face to face with a few people in the group. The interview was relaxed and not structured. The interviewees came across somewhat unprepared. Most of the questions were "what is the biggest/most difficult/worst/best.......... you've experienced"?