The Department of Prime Minister and Cabinet's (PM&C) principal function is to provide high-quality policy advice to the Prime Minister and the Cabinet on matters that are at the forefront of public and government administration, including domestic and international affairs and, in particular, the implications of proposals for Commonwealth-State relations. The Department briefs the Prime Minister, the Cabinet Secretary, and the Parliamentary Secretary to the Prime Minister, and consults extensively across the Australian Public Service (APS) to ensure that the advice provided draws on the most appropriate sources.