From the late 20th century judges, government and the Waitangi Tribunal began to hammer out the principles of the Treaty of Waitangi. The treaty is deemed to bind Māori and Pākehā New Zealanders in a partnership in which they must act reasonably and with utmost good faith.
Full story by Janine Hayward. Read 'Principles of the Treaty of Waitangi – ngā mātāpono o te tiriti', here. Te Ara - the Encyclopedia of New Zealand, updated 8-Oct-14.