Through a synthesis of test publisher norms and national longitudinal datasets, this study provides new national norms of academic growth in K-12 reading and math that can be used to reinterpret conventional effect sizes in time units. We propose d' a time-indexed effect size metric to estimate how long it would take for an "untreated"…

By presenting a brief general history of educators' efforts and struggles to influence the intellectual and social growth of young children, it will help the reader understand why the Exemplary Center for Reading Instruction (ECRI), a research and consulting group concerned with instructional practices, sought for and obtained funds from the U.S.…