Very detailed Position Description sent beforehand so I knew what they wanted and could prepare. Was sent a questionnaire a week beforehand which I filled in and took along. This was copied on my arrival and panel all had a copy for the presentation (which they seemed to make notes on). My immediate boss met me first and we talked for around 20 mins before the formal interview. He told me who was going to be on the panel, their roles and interests, so when I went to the interview I knew what was going on. Very good process for getting rid of nervousness. 4 interviewers, and a reasonably free-form process for 40 minutes. They had all read my CV (which was a new experience).