The politics of the Cook Islands, an associated state, takes place in a framework of a parliamentary representative democracy within a constitutional monarchy. The Queen of New Zealand, represented in the Cook Islands by the Queen's Representative, is the Head of State; the prime minister is the head of government and of a multi-party system. The Islands are self-governing in free association with New Zealand and are fully responsible for internal affairs. New Zealand retains some responsibility for external affairs, in consultation with the Cook Islands. In recent years, the Cook Islands have taken on more of its own external affairs; as of 2005, it has diplomatic relations in its own name with eighteen other countries. Executive power is exercised by the government, while legislative power is vested in both the government and the islands' parliament. The judiciary is independent of the executive and the legislatures.