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 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…

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,…

The "2011 State Preschool Yearbook" is the newest edition of our annual report profiling state-funded prekindergarten programs in the United States. This latest "Yearbook" presents data on state-funded prekindergarten during the 2010-2011 school year as well as documenting a decade of progress since the first…

The "2010 State Preschool Yearbook" is the eighth in a series of annual reports profiling state-funded prekindergarten programs in the United States. This latest Yearbook presents data on state-funded prekindergarten during the 2009-2010 school year. The first report in this series focused on programs for the 2001-2002 school year and…

This document suggests the following eight model indicators of quality in adult education programs: (1) learners demonstrate progress toward attainment of basic skills and competencies that support their educational needs; (2) learners advance in the program or complete program requirements that allow them to continue their education or training;…

The process of determining the effectiveness of developmental programs in two-year colleges was the focus of this study. It was limited to New York State, and designed in response to a request for proposals issued by Bureau of Grants Administration, New York State Education Department. The need for systematic review of developmental programs and…

A two-part report, sponsored by the Northwest Regional Exchange, focuses on the role of technical assistance in educational settings. This document, part II of the report, examines selected change models for establishing technical assistance systems and implications for action. After a brief introduction, the following critical components of…

The "2009 State Preschool Yearbook" is the seventh in a series of annual reports profiling state-funded prekindergarten programs in the United States. This latest Yearbook presents data on state-funded prekindergarten during the 2008-2009 school year. The first report in this series focused on programs for the 2001-2002 school year and…