This publication outlines the aim of the Day Therapy Centre (DTC) Program, which is to provide a wide range of therapies such as physiotherapy, occupational therapy, speech therapy and podiatry to frail older people living in the community and to residents of Commonwealth-funded residential aged care facilities. The Data Dictionary documents the outcomes of development work undertaken by the Institute, in collaboration with the Commonwealth Department of Health and Ageing, during 2001 and 2002 and includes definitions of the individual data items needed to assist with planning and policy development in the DTC program.