Prime Minister of New Zealand signed a number of international treaties. In 1967, Keith Holyoake became the first New Zealand prime minister to select candidates for the position of governor-general without any involvement of the British government. Holyoake advised the monarch, Queen Elizabeth II, to appoint Sir Arthur Porritt, the first New Zealand–born governor-general. After the mixed-member proportional (MMP) system was introduced in 1996, prime ministers have had to manage minority governments. The skill of MMP management was exemplified by Helen Clark's nine years as prime minister (1999–2008), when her Labour Party remained in power thanks to a range of confidence and supply agreements with
Deputy Prime Minister of Canada deputy premiership to the premiership of British Columbia in 1999, following the resignation of Glen Clark, and Kathy Dunderdale ascended from the deputy premiership to the premiership of Newfoundland and Labrador in 2010, following the resignation of Danny Williams. Extended notice is usually given when a sitting prime minister does not plan to lead his/her party into another election. Leadership contests to determine the successor to a prime minister are usually held during the final days of the incumbent's term, and are traditionally a lengthy and competitive process. In almost all cases, the outgoing prime minister hands over power directly