Children's academic and social development before third grade is highly predictive of later success in school and beyond. Research shows that during those early years, the gains children make in language and literacy, mathematics and social skills, and their growth as learners and thinkers are associated with a range of benefits, from academic achievement to economic stability to healthy habits and behaviors. "The Untapped Potential of an Early Childhood Assessment System: A Strategy for Improving Policies and Instruction from Early Childhood through 3rd Grade" outlines how state leaders can reduce or streamline the assessments being used in early learning programs and elementary schools, achieve economies of scale for educator training and leverage existing data systems to yield more powerful data to inform decision-making.