The Department of Prime Minister & NEC, apart from being the Principal Advisor to the Prime Minister and Cabinet also performs other functions. There are three Wings in the Department headed by three Deputy Secretaries, namely; Operations Wing, Policy Wing 1, Policy Wing 2. There are also four Secretariats, namely; National Executive Council (NEC) Secretariat, Central Agencies Coordination Committee (CACC) Secretariat, Office of Security Coordination Assessment (OSCA) Secretariat and Asia Pacifica Economic Corporation (APEC) Secretariat. In addition, there are other offices such as the Office of Legislative Counsel (OLC) and Commission of Inquiry (COI).
Apart from this core functions, there are also other Offices that operate independently but falls under the ambit of the Chief Secretary, where the Department from time to time provides the necessary assistance and coordination in relation to strategic human resource management, prudent financial management and corporate support services to the office the Governor-General, Government Printing Office (GPO), Gas Project Coordination Office (GPCO) , National Coordination of Bougainville Affairs (NCOBA) and the National Intelligence Office (NIO).