The Early Development Index (EDI) is a teacher-completed checklist, intended to be a population-level tool to measure children's readiness for school and to alert communities to potential developmental problems in children. In response to the increasing popularity of the EDI, this paper provides a critical and timely evaluation and identifies the areas for improvement and modifications. The paper aims: (1) to identify the limitations of the EDI as a universal screening tool, particularly with regard to children from culturally and linguistically diverse backgrounds (CALD); (2) to alert readers to the potential negative implications of the current EDI for communities and society, and (3) to recommend ways for improvement so that the EDI will become a valid and culturally appropriate screening tool for monitoring early development in CALD children. The ultimate aim is to help build an education system and a society that can respect cultural and individual differences.