The Australian Early Development Index (AEDI) was completed nationally for the first time between 1 May and 31 July 2009 and information was collected on 261,147 Australian children during their first year of full-time school.
A follow up data collection occurred in some small areas in 2010 and localities with small numbers of children were combined so that more communities could have their results released. In 2011, 97.8 per cent of Australian communities had their AEDI results released.
The second AEDI collection was undertaken between 1 May and 31 July 2012 and information was collected on 289,973 Australian children during their first year of full-time school. Overall, 96.5 per cent of all Australian children registered to commence school in 2012 were included in this cycle of the AEDI.
A small number of changes were made to the 2012 Early Development Instrument to improve the administration of the instrument and the quality of the data. These changes are documented in the AEDC Data Dictionary.
In 2014, the AEDI was renamed The Australian Development Census (AEDC) to clearly recognise the fact that the instrument is used as a population-based measure to child development.
The 2015 data collection was the third collection and undertaken between 4 May and 31 July 2015. Information was collected on 302,003 Australian children during their first year of full-time school in 2015.
The 2018 data collection was the fourth collection and was undertaken between 1 May and 3 August 2018 (26 August in New South Wales and Victoria). This cycle included 96.4% of children (308,953) in their first year of full-time school. Results are now available through the Data Explorer.