Round one consisted of a one hour mock planning session. The candidate played the PGM role, while 6 or 7 interviewers played mock roles with "personalities". Some preparation was needed before the session, but nothing extensive. The candidate is observed while executing the planning session and handling the various mock personalities of the team.
Strong leadership in a group setting along with good organization and thinking on your feet will likely help the candidate succeed. However, this session provides little opportunity to question the interviewers about the job, company, etc., something that would presumably come in round 2. I didn't get to round 2.