As far as I know, there is usually only one interview administered for this position. Mine was a panel interview with four people, who were given scripted questions to ask. No one deviated from the questions as they were written, and very little response is given to answers. I walked out of this interview thinking I had bombed it because the interviewers were so stoic the whole time. They told me I would find out within two weeks whether I had been placed on the "to be hired when we have allocations" list, and a week later I was called an offered a job.