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The achievement gap, the persistent difference in academic performance between students from different racial, ethnic, and socioeconomic groups, is one of the most extensively documented patterns in American education. Black and Hispanic students, on average, score significantly below white and Asian students on standardized assessments at every grade level. Students from low income households score significantly below students from higher income households. These gaps are not new, and they have proven remarkably resistant to decades of educational reform efforts, including standards movements, high stakes accountability, school choice expansion, and technology investment. Understanding why they persist requires understanding what actually produces them.

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== What Produces the Gap ==

The achievement gap is primarily an opportunity gap. It reflects differences in the conditions of children's lives, both inside and outside school, that shape their preparation for and engagement in formal learning. Children from low income households are more likely to experience food insecurity, housing instability, neighborhood violence, and parental stress, all of which have documented effects on brain development, stress regulation, and school readiness. They are less likely to have access to high quality preschool, to books in the home, to enrichment activities over the summer, and to the expansive vocabulary exposure that predicts later reading achievement. These differences begin before children enter school and accumulate over the years of schooling.

Inside schools, students from historically marginalized groups are more likely to be taught by less experienced teachers, to be assigned to lower tracks, to receive less challenging academic content, and to encounter discipline systems that remove them from instruction more frequently. They are more likely to attend schools with fewer resources, higher teacher turnover, and the organizational instability that high poverty schools often experience. The school system itself, as described by educator Jonathan Kozol, produces and perpetuates the gaps it is then held responsible for closing.

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== What Narrows the Gap ==

The evidence on gap reduction comes from several sources. High quality early childhood programs, particularly those that begin in infancy and provide comprehensive support to both children and families, show some of the largest and most durable effects on achievement gaps of any educational intervention. The Perry Preschool Program, the Abecedarian Project, and more recent evaluations of universal pre K programs in Boston and Tulsa all show that high quality early education produces gains that persist through elementary school and beyond, with the largest effects for the most disadvantaged children.

Within schools, several practices consistently narrow gaps when implemented with fidelity. High dosage tutoring, which provides one on one or small group instruction from trained tutors during the school day, shows among the largest effect sizes of any school based intervention in recent research. Extended learning time, when used to provide additional targeted instruction rather than more of the same, reduces gaps. Comprehensive student support services that address health, mental health, and family stability issues create the conditions for academic engagement. Teacher quality is the most powerful school based variable: students who have access to highly effective teachers for consecutive years close gaps; students who have access to less effective teachers for consecutive years widen them.

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== What Does Not Work ==

Several approaches to gap reduction have not produced the promised results. High stakes accountability systems that attach consequences to test scores without addressing the conditions that produce low scores have not narrowed gaps and have sometimes produced gaming behaviors that reduce the informativeness of the assessments they rely on. Charter schools as a sector do not close gaps; some charter schools produce significant gains for high need students, and some produce outcomes no better than traditional public schools. The evidence does not support treating any single intervention as sufficient. Closing achievement gaps requires simultaneously addressing the out of school conditions that produce them and the in school conditions that compound them.

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''Originally published May 21, 2020 on [https://docmoates.com/blog/the-achievement-gap-understanding-its-roots-and-what-narrows-it/ docmoates.com].''