to elect councillors, and is also used in multi-member wards of some city and district councils, including Dunedin and Wellington City. Countries using this system include Australia (upper house) and the Republic of Ireland. Supplementary member – Also known as parallel voting. Each voter receives two votes: one for a party and a one for their local electorate MP. In each of the 90 electorates across New Zealand, the local MP is elected using first past the post, and the candidate with the most votes is elected the MP for that electorate. In addition to the 90 electorate MPs, 30 list MPs are elected at-large using the party vote, with the proportion of the 30 seats a party gets being determined by the proportion of the party vote – if a party gets 30% of the party votes, it gets 30% of the list seats (i.e. 9 seats). It has never been used in New Zealand. Countries using this system include Japan and South Korea. After the referendum Under the Electoral Referendum Act 2010, the referendum results could trigger the two possible outcomes. In the unlikely event of a tie, then the keep MMP option would eventuate. Majority vote to keep the MMP system If the voters voted in majority to keep the existing MMP system, then the system would be retained. Also under the Electoral Referendum Act, if the majority of voters voted to keep MMP, then an inquiry into the MMP system would automatically be undertaken by the Electoral Commission to see if any modification is desirable, including to thresholds (currently a party needs 5% of the party vote or one electorate to get seats in Parliament), the order of candidates on party lists (the inability of voters to rank list candidates in order of preference), proportionality (overhangs, and the effects of population change on the number of general electorate seats), and dual candidacy (electorate candidates also running as list candidates). There were calls from the Labour and Green parties, and even the opposing Vote for Change group, to hold the review of MMP regardless of the result of the referendum to resolve problems in the current system before it goes to the second referendum. Majority vote to change the electoral system If the voters voted in majority to change to another electoral system, then the government following the 2011 election could call a second referendum to be