In randomized control trials, such as the one the authors conducted in Alabama, moderators are potentially an important source of variation in treatment effects. Whether moderators used in the RCT's analysis are pre-existing characteristics of students, their teachers, or the school or other organizational context, they can point toward…

The purpose of this study was twofold: (1) to determine the efficacy of the Leveled Literacy Intervention program (LLI) in increasing reading achievement for K-2 students and (2) to examine LLI program implementation fidelity. This study evaluated LLI in two U.S. school districts and used a mixed-method design to address the following key research…

Academic achievement in the nation's lowest performing schools is troubling. Despite improvements in students' overall academic achievement over the past few decades, proficiency gaps in reading and mathematics remain across income, racial, and ethnic groups. One promising strategy for reducing achievement gaps is to expand the school day, often…

Mastering basic numeracy and literacy skills is one of the most fundamental goals of education. However, it is estimated that 250 million primary-school-age children lack basic reading, writing and math skills (UN, 2013). Children living in war and poverty stricken countries are among the least likely to attain those basic goals. The United States…

Past research on school-level factors that predict children's development has focused largely on associations between a limited number of characteristics, such as school size and school resources, and children's academic achievement. Few studies take a more comprehensive look at the measurement of school climate or examine its relationship to…

"The No Child Left Behind Act of 2001" (PL 107-110) established the Reading First Program (Title I, Part B, Subpart 1), a major federal initiative designed to help ensure that all children can read at or above grade level by the end of third grade. Reading First (RF) builds upon research indicating that effective reading instruction on…

Randomized controlled trials (RCTs) are considered the "gold standard" for evaluating an intervention's effectiveness. Recently, the federal government has placed increased emphasis on the use of opportunistic experiments. A key criterion for conducting opportunistic experiments, however, is that there is relatively easy access to data…

This paper investigates the extent to which spring-to-spring testing timelines bias teacher value-added as a result of conflating summer and school-year learning. Using a unique dataset that contains both fall and spring standardized test scores, the author examines the patterns in school-year versus summer learning. She estimates value-added…

This meta-analysis is designed to build on the existing knowledge base by examining vocabulary interventions specifically for factors associated with child outcomes for at-risk children. Specifically, the authors addressed the following questions: (1) To what extent are vocabulary interventions an effective method for at-risk children prior to…

While there are many reasons why late hiring may affect student achievement, no empirical studies have documented this effect in practice. This paper presents the first estimates of the direct impact of late hiring on students' academic achievement, sheds light on two competing explanations for the struggles of late-hire teachers advanced in the…

The Massachusetts Department of Elementary and Secondary Education (ESE) has supported a multi-year study of the Expanded Learning Time (ELT) initiative to learn about the process and impact of ELT. Abt Associates Inc. is conducting this research. The study has two components: 1) a planning and implementation component that explores the…

Prior reviews of evidence for the impact of formative assessment on student achievement suggest widely different estimates of formative assessment's effectiveness, ranging from 0.40 and 0.70 standard deviations in one review. The purpose of this study is to describe variability in the effectiveness of formative assessment for promoting student…

Value-added modeling (VAM), one class of statistical models used to estimate individual teacher's or school's contribution to student achievement based on student test score growth between consecutive years, has become increasingly popular in the last decades. Despite the increasing popularity of VAM, many researchers are concerned about the…

Because digital tutoring is rapidly expanding, more rigorous, independent evaluations of their effectiveness is critical to inform federal, state, and local policy decisions that influence their role and application of technology in educating underserved students. The in-depth observations and vignettes in this paper illustrate the challenges in…

In this study the authors test whether matching using intact local groups improves causal estimates over those produced using propensity score matching at the student level. Like the recent analysis of Wilde and Hollister (2007), they draw on data from Project STAR to estimate the effect of small class sizes on student achievement. They propose a…