The National Offence Index (NOI) has been developed by the Australian Bureau of Statistics as a statistical tool to enable the output of nationally comparable offence information within the field of crime and justice statistics. The Index detailed in this publication supercedes the first version of NOI which was released in 2002 as an Appendix in the Criminal Courts, Australia (cat. no. 4513.0) publication. This is the first time NOI has been published in its own right.
The National Offence Index is a tool which provides an ordinal ranking of the offence categories in the Australian Standard Offence Classification (ASOC) according to perceived seriousness in order to determine a principal sentence. The purpose of NOI is to enable the representation of an offender by a single offence in instances where multiple offences occur within the same incident or where defendants have multiple charges in criminal cases. For instance, where an offender has two or more offences within the same incident that could be classified to different offence categories of ASOC classification (e.g. 0211 - Serious assault resulting in injury and 0621 - Blackmail and extortion), by applying NOI, a 'principal offence' can be selected to represent that offender. In this instance the NOI ranking '23 - Serious assault resulting in injury' would be the principal offence.
This publication presents the revised NOI, to be used in conjunction with the second edition of ASOC.