The NAS was responsible for preparing long–range analytical assessments of international issues.
The foreign intelligence assessment functions of JIO were assumed by the Office of National Assessments (ONA) in 1977 and the JIO was fully replaced by the Defence Intelligence Organisation (DIO) in 1990.
There also existed a Joint Intelligence Bureau (JIB) within the Department of Defence responsible for geographic, infrastructure, economic, scientific and technical intelligence in the Asia-Pacific region.
[2] The existence of JIO was initially a secret, but was revealed by Prime Minister William McMahon when he blurted out something about "J-ten".
The 1977 tabled recommendations of the Royal Commission on Intelligence and Security, established on 21 August 1974 by Prime Minister Gough Whitlam and led by Justice Robert Hope, called for an independent authority to provide intelligence assessments on political, strategic and economic issues directly to the Prime Minister.