What Works ClearinghouseFrom the WWC website: "The goal of the WWC is to be a resource for informed education decision making. To reach this goal, the WWC identifies studies that provide credible and reliable evidence of the effectiveness of a given practice, program, or policy (referred to as “interventions”), and disseminates summary information and free reports on the WWC website."
This services is managed by the Institute of Education Sciences on behalf of the U.S. Department of Education