The Prime Minister has the power, under section 21 of the Public Service Act 1999, to issue general directions in writing to agency heads in relation to the management and leadership of APS employees. At October 2018, there are no current Prime Minister's Directions.
Find more information at Workplace relations. This webpage includes information on the Commonwealth bargaining policy and award modernisation. It also has links to APS remuneration reports and the Australian Public Service Commission's allowance subscription service.