Although their research agendas may vary widely, school library researchers from around the world share the common goal of conducting studies designed to advance the field of school librarianship. International school library scholars are united in their efforts to prove that quality school library programs can have a significant impact on student…

With more than 3 million participants per year, the Advanced Placement (AP) program is one of the most popular programs in the United States for exposing high-achieving high school students to advanced academic content. Sponsored by the College Board, the AP program provides a framework in which high school teachers can teach introductory…

The What Works Clearinghouse (WWC) evaluates research studies that look at the effectiveness of education programs, products, practices, and policies, which the WWC calls "interventions." Many studies of education interventions make claims about impacts on students' outcomes. Some studies have designs that enable readers to make causal…

The past half-century has witnessed a dramatic increase in the scale and complexity of scientific research. The growing scale of science has been accompanied by a shift toward collaborative research, referred to as "team science." Scientific research is increasingly conducted by small teams and larger groups rather than individual…

The What Works Clearinghouse (WWC) Standards Briefs explain the rules the WWC uses to evaluate the quality of studies for practitioners, researchers, and policymakers. Attrition (loss of sample) occurs when individuals initially included in a study are not included in the final study analysis. Attrition is a common issue in education research and…

The present paper, which is intended for a diverse audience of evaluation researchers, applied social scientists, and research funders, provides a broad overview of the conceptual and statistical issues involved in using multisite randomized trials to learn "about" and "from" variation in program effects across…

In education research and in many other fields, researchers are often interested in testing the effectiveness of an intervention on multiple outcomes, for multiple subgroups, at multiple points in time, or across multiple treatment groups. The resulting multiplicity of statistical hypothesis tests can lead to spurious findings of effects. Multiple…

Assembly Bill 705 (AB 705) sought to increase successful completion of transfer-level math and English courses by addressing systemic problems in traditional placement policies and curricular structures. The law requires colleges to maximize the probability that students who enroll in credit English as a second language (ESL) courses complete…

These technical appendices are for the report, "English as a Second Language at California's Community Colleges: An Early Examination of AB 705 Reforms." Assembly Bill 705 (AB 705 Irwin) sought to increase successful completion of transfer-level math and English courses by addressing systemic problems in traditional placement policies…

Suppose an education researcher wants to test the impact of a high school drop-out prevention intervention in which at-risk students attend classes to receive intensive summer school instruction. The district will allow the researcher to randomly assign students to the treatment classes or to the control group. Half of the students (the treatment…

Community colleges serve more students than any other institutional type in the United States, and internationalization is an inherent component of community colleges that advances student knowledge, facilitates student success, and serves the needs of local communities. As most community college students do not enroll in four-year institutions,…

Programs that address the needs of low-income parents and children at the same time may hold promise for reducing the transmission of poverty across generations. Contemporary programs of this type address some key weaknesses that may have limited the effectiveness of earlier such approaches, including too little attention paid to the quality,…

How do responsive adult-child interactions influence early language development? How do a child's language skills develop in tandem with social-emotional development, executive function, and literacy? What are effective ways to help parents support their child's development? Uncover the answers to these questions in this fascinating book, which…

Think College Reports present descriptive data in narrative and tabular form to provide timely information to researchers, practitioners, and policymakers for review and use. This report provides program- and student-level data reported by TPSIDs (Transition and Postsecondary Programs for Students with Intellectual Disabilities) during the…

The overarching purpose of this monograph is to move the mentoring conversation forward by offering an updated synthesis of the undergraduate mentoring scholarship published between 2008 and 2015. The compendium of research reviewed provides practitioners and researchers with an evidence-based view of the influence of mentoring on the academic and…