An early start: Skill grouping and unequal reading gains in the elementary years

Separating elementary school students into skill-based reading groups within classrooms affects a vast majority of young children in the United States. The impact of this institutional process on students' learning has important implications for sociological perspectives on education and stratification, yet a lack of studies comparing similar grouped and nongrouped students has prevented scholars from drawing conclusions as to the salience of this type of curriculum differentiation. Drawing on data from the first- and third-grade waves of the Early Childhood Longitudinal Study-Kindergarten Cohort, I use propensity score matching techniques to estimate the impact of low, middle, and high group placement on reading gains relative to nongrouped instruction. Findings suggest that high-grouped students learn more, and low-grouped students learn less, than comparable nongrouped students. These analyses, which significantly lessen the extent to which selection into groups may bias results, add strong evidence to the view that within-classroom skill grouping in the early elementary years promotes unequal reading gains compared to nongrouped instruction. I conclude by discussing the theoretical and policy implications of these findings.