The effectiveness of Tier 2 interventions may depend on the variability of student skills within an intervention group. We investigated the effect of initial variability within intervention groups using data from a large-scale study of ROOTS, a Tier 2 kindergarten mathematics intervention. Our research questions were as follows: Does mathematics…

The effectiveness of Tier 2 interventions may depend on the variability of student skills within an intervention group. We investigated the effect of pretest variability within intervention groups using data from a large-scale study of ROOTS, a Tier 2 kindergarten mathematics intervention. Our research questions were as follows: Does mathematics…

In today's interconnected world, cross-cultural competence is essential for students' success. This article investigates how educational interventions foster this crucial skill. Using a mixed-meta research method, the study combines a meta-analysis of 16 quantitative studies (12,800 participants) with a meta-thematic analysis of 7 qualitative…

Transition to kindergarten is an important developmental milestone for children and families. This study explored factors associated with kindergarten readiness focusing on the impact of a summer kindergarten transition program. A mixed-method design was employed, and the qualitative data from interviews with 16 randomly selected kindergarten…

This brief is one in a series aimed at providing K-12 education decision-makers and advocates with an evidence base to ground discussions about how to best serve students during and following the novel coronavirus pandemic. It begins with an at-a-glance view of an effective voluntary academic summer learning program structure (duration, class…

Many science, engineering, technology, and math (STEM) majors fail to complete their degrees, and those who leave report they lack learning skills required for STEM coursework. In 2 studies, we examined the effects on students' exam performances when they were assigned to complete a brief digital learning skills training program we embedded into…

In a flipped classroom, an increasingly popular pedagogical model, students view a video lecture at home and work on exercises with the instructor during class time. Advocates of the flipped classroom claim the practice not only improves student achievement but also ameliorates the achievement gap. We conduct a randomized controlled trial at West…

Increasing class size is one of the key variables that policy makers can use to control spending on education. But the consensus among many education researchers is that smaller classes are effective in improving student achievement. This view has led to a policy of class size reductions in a number of US states, the UK, and the Netherlands. This…

Performance during the first year of college and in introductory courses has been widely identified as critical to college students' retention and success. Accordingly, interventions to assist beginning college students in gateway courses have gained increased attention in higher education. This study tested such an intervention using learning…

This research design was a mixed methods embedded study with a quasi-experimental component in the quantitative portion identifying the teachers and students as independent variables and the Professional Learning Communities (PLCs) that are aligned with teacher effectiveness and student achievement as the dependent variables. The confounding…

Despite the accumulated evidence that retention is an ineffective and potentially harmful remedial strategy, several countries struggle with high levels of retention in compulsory schooling. This article provides evidence of the impact of the Portuguese national educational policy "Programa Mais Sucesso Escolar" (PMSE) using class size,…

Background: Class size reduction (CSR) is an enduring school reform undertaken in an effort to improve academic achievement and has been widely encouraged in the United States. Supporters of CSR often cite the positive contemporaneous and carryover effects of Project STAR. Much has been discussed regarding the robustness of the contemporaneous…

The new Every Student Succeeds Act offers states flexibility to create new approaches to school accountability and to design appropriate interventions for schools in need of assistance. The law states that the interventions should be "evidence-based" and defines the kinds of research evidence states need to provide when choosing…

A recent report from Michigan's Mackinac Center asserts that there is little or no relationship between student achievement and marginal increases to what the report characterizes as the already "high" levels of spending in that state. Yet the report never substantiates its assertion that present spending levels are high, on average, or…

This study used a mixed-methods approach to explore the heterogeneity of effectiveness between supplemental educational services (SES) providers in the Chicago Public Schools (CPS). Using surveys of schools and SES providers, and statistical modeling, providers using college graduates and teachers as tutors were found to be more effective than…