The Commonwealth/State Disability Agreement Minimum Data Set (CSDA MDS) has provided data on Australia's national program of disability support services since 1994.By 1999, it had become obvious that changes in the nature of service provision, information needs and technology in use in the disability field had created a need for review and redevelopment of the collection.This report focuses on the processes undertaken to redevelop the collection, and outlines how the new data will satisfy a far wider range of information needs relating to this major national program.