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 are 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