Constitution
New Zealand has no formal codified constitution; the constitutional framework consists of a mixture of various documents (including certain acts of the United Kingdom and New Zealand Parliaments), the Treaty of Waitangi and constitutional conventions. The Constitution Act in 1852 established the system of government and these were later consolidated in 1986. Constitutional rights are protected under common law and are strengthened by the Bill of Rights Act 1990 and Human Rights Act 1993, although these are not entrenched and can be overturned by Parliament with a simple majority.[1] The Constitution Act describes the three branches of Government in New Zealand: The Executive (the Sovereign and Cabinet), the legislature (Parliament) and the judiciary (Courts).
Executive Head of State
Queen Elizabeth II is the current Queen of New Zealand and the Realm of New Zealand's head of state.[2][3] The New Zealand monarchy has been distinct from the British monarchy since theStatute of Westminster Adoption Act 1947, and all Elizabeth II's official business in New Zealand is conducted in the name of the Queen of New Zealand, not the Queen of the United Kingdom. While Royal Assent and the royal sign-manual are required to enact laws, letters patent, and Orders in Council, the authority for these acts stems from the New Zealand populace.[4] In practice, the functions of the monarchy are conducted by the Governor-General, appointed by the monarch on the advice of the Prime Minister. As of 2011, the Governor-General is Sir Jerry Mateparae. The Governor-General's powers are primarily symbolic and formal in nature. The Governor-General formally has the power to appoint and dismiss Prime Ministers and to dissolve Parliament; and also formally signs legislation into law after passage by Parliament. The Governor-General chairs the Executive Council, which is a formal committee consisting of all ministers of the Crown. Members of the Executive Council are required to be Members of Parliament, and most are also in Cabinet
Head of Government
Cabinet is the most senior policy-making body and is led by the Prime Minister, who is also, by convention, the Parliamentary leader of the governing party or coalition, and is known as the head of government. The New Zealand Cabinet is responsible to the Parliament of New Zealand, from which its members are derived. All Cabinet Ministers must be Members of Parliament (MPs) and are collectively responsible to it.
General elections are held every three years, with the last one in 2011 and the next one in September 2014. National won the 2008 election ending nine years of Labour led Government. National leader John Key formed a minority government, negotiating agreements with the ACT party, the United Future party and the Māori Party.[6] The leaders of each of these parties hold ministerial posts but remain outside of Cabinet. There are currently three parties inOpposition; the Labour Party, the Green Party, and New Zealand First. The Leader of the Opposition is David Cunliffe, who is Leader of the Labour Party.

John Key, MP, Prime Minister of New Zealand and leader of the National Party.
