Why did the British & Maori want a treaty?

WALt:understand why the Treaty of Waitangi was created.
We been learning about the Treaty of Waitangi, why the British & Maori want 
a treaty.
We had a task which was a scavenger and it was difficult and fun, first we had
to find information from the article and write the answer in caps and no space.
Did you know did the British taught the Maori how to read, write and farm with new
methods and equipments.