The What Works Clearinghouse (WWC) was established in 2002 by
the U.S. Department of Education's Institute of Education
Sciences to provide educators, policymakers, and the public with
a central and trusted source of scientific evidence of what
works in education. The WWC is administered by the Department,
through a contract to a joint venture of the American Institutes
for Research and the Campbell Collaboration. To provide
information needed by decision-makers, the WWC reviews and
reports on existing studies of interventions (education
programs, products, practices, and policies) in selected topic
areas. WWC reviews of the evidence apply a set of standards that
follow scientifically valid criteria for determining the
effectiveness of these interventions. The WWC provides its
findings in accessible, user-friendly, online reports, which
include the following: - Reports on evaluation studies that pass
the WWC standards - Reports on the research base for each
identified intervention - Reports that synthesize th