The current set-up we have for elections is where you enrol to vote on either the general or the Māori electoral roll. You've got that small four-month period every five to six years within which Māori voters can move between the rolls, and there was genuine reason for this. It was to align those electorate boundaries with the information received from the five-yearly census, and this is to make sure that each electorate has around the same number of people in it, giving equal representation within Parliament. It also allows for the boundary reviews to occur, making sure that there are enough electorates for the population.