Northern Territory self-government: The Northern Territory did not gain full representative self-government until 1978, although this had been planned since 1973.
'In 1973 the Whitlam [federal] Labor government established a joint committee of the federal parliament to plan for a setting up of a legislative assembly in 1974. But, in a style which Territorians would claim has been a consistent pattern, the Commonwealth Committee reported after the new assembly had been designed, confirmed and elected. The Legislative Assembly of nineteen members had all of the structures and processes of a representative parliament, but its powers remained the same as those of the previous Legislative Council. In 1978, however, after protracted negotiations with the Fraser Liberal government, the territory was granted self-government', Dean Jaensch, 'Northern Territory', in Jeremy Moon and Campbell Sharman (editors), Australian Politics and Government: The Commonwealth, the States and the Territories, pp 224-238 (Melbourne: Cambridge University Press, 2003, ISBN 0521532051).
This situation meant that the Letts government was not technically a ministry under a system of responsible government, but an executive working under the supervision of the Commonwealth government.
Premier and first minister: The head of government in both self-governing territories is called the first minister, an equivalent office to that of premier. In this database and website, general headings referring to premiers include the first ministers of territories.