By convention, the Premier is a Member of the Legislative Assembly, elected by political party colleagues and commissioned by the Governor to be the leader of a Ministry supported by a party or coalition of parties holding the majority of seats in the Legislative Assembly. In other words, the Premier is effectively the Head of Government in the State. The Premier has the final political responsibility for the administration of the State. The Premier is able to allocate Ministerial responsibilities, chairs Cabinet meetings and is responsible for Cabinet's operation.
Although the State Constitution provides that the Governor determines the dates for elections and the sitting or proroguing of the Parliament, it is the Premier who makes these decisions and provides advice to the Governor in Executive Council accordingly.
The Australia Acts provide that the appointment of the Governor is made by the Sovereign on advice of the Premier.