Early Childhood Environment Rating Scale, Third Edition (ECERS-3)

The ECERS-3 is a comprehensive observational rating scale assessing the quality of early childhood education and care environments for preschool-age children (ages 3–5 years, or ages 2.5–5.5 years). Developed by Harms, Clifford, and Cryer (2015), it evaluates classroom environment, materials, interactions, and practices across 35 items grouped into six domains: Space and Furnishings, Personal Care Routines, Language and Literacy, Learning Activities, Interaction, and Program Structure. The ECERS-3 is the most widely used instrument for assessing early childhood program quality and has become the standard for child care licensing, accreditation, and quality improvement research.