Empirical growth benchmarks, as introduced by Hill, Bloom, Black, and Lipsey (2008), are a well-known way to contextualize effect sizes in education research. Past work on these benchmarks, both positive and negative, has largely avoided confronting the role of vertical scales, yet technical issues with vertical scales trouble the use of such…

University class size is a frequently debated topic among stakeholders given its relation to student achievement, teaching and learning, program evaluation, and education economics. However, the extant literature in both K-12 and higher education contexts regarding class size is equivocal, with some citing evidence of an adverse effect on student…

Education researchers, practitioners, and policymakers alike are committed to identifying interventions that teach students more effectively. Increased emphasis on evaluation and accountability has increased desire for sound evaluations of these interventions; and at the same time, school-level data have become increasingly available. This article…