As I understand it, it is that the order of questions for the first round of questioning be as follows: Liberal, Bloc, NDP, CPC. Questioning during the second round shall alternate between the opposition members and government members in the following fashion: Liberal, Bloc, Conservative, Conservative, Liberal, Conservative, Conservative, based on the principle that each committee member should have a full opportunity to question the witnesses. If time permits, further rounds shall repeat the pattern of the first round, at the discretion of the chair.
On February 3rd, 2009. See this statement in context.