This series consists of files, known as 'volumes' covering internal administrative matters, operational matters and particular topics. Files are registered in a multiple number system in the agency. Part numbers are used when the contents of a file extend beyond one volume. The files are ordinary manila file covers, or plastic file covers with fold-over flaps from either side, with a cardboard insert in the front flap bearing such information as file number; file title; date range; disposal review date; and file movements. Files can contain material inherited from predecessor agencies such as the Commonwealth Investigation Service and the wartime Security Service which was considered of continuing value at the time of inheritance. Some items in the series have been microfilmed as a disposal measure prior to destruction. These items form part of CRS A6126, Microfilm copies of personal and subject files (CRS A6119 and CRS A6122). The material is retained by ASIO. Requests for access under s40 of the Archives Act 1983 are submitted to ASIO, who then undertake the research task of identifying if any records belonging to this or related series contain information relevant to the subject of the access request. Material is only transferred to Australian Archives as a result of these requests, and at the time of transfer a single number is imposed.

Disposal history

Original records from consignments A6122/2, A6122/4, A6122/6, A6122/7, A6122/9, A6122/13, A6122/22, A6122/24, A6122/26, A6122/27, A6122/28, A6122/31, A6122/33, A6122/35, A6122/36, A6122/37, A6122/38 and A6122/43, were permanently withdrawn by the agency on 12 July 2016.

Previous series unregistered

?1939-?1953: Investigation files, single number series with 'A'
             prefix [Note: Original files no longer extant, copies of
             some in CRS A6126]