The Department seeks comment on whether to extend by two years the compliance date of these regulations from July 1, 2018, to July 1, 2020, and, if so, whether to extend the date for including children ages three through five in the analysis of significant disproportionality with respect both to the identification of children as children with disabilities and to the identification of children as children with a particular impairment from July 1, 2020, to July 1, 2022.