The HACC Data Dictionary Version 1.0 is the culmination of development work undertaken by the Australian Institute of Health and Welfare as a result of the Review of HACC Data Requirements and the development of a draft HACC Minimum Data Set. The draft Minimum Data Set was accepted by HACC Officials, in principle (subject to further development work), as the basis of a new national HACC data collection to replace the existing HACC Service Provision collection, the HACC User Characteristics Survey and the Community Options Project collections. The HACC Data Dictionary Version 1.0 contains all of the data elements that are required to be reported in the HACC MDS collection. It also contains specifications for those data elements that need to be recorded on the information systems of HACC agencies in order to support the reporting requirements of other data elements. That is, the HACC Data Dictionary contains the specifications for both supporting and reporting data requirements.