This Guide seeks to provide assistance to educational practitioners in evaluating whether an educational intervention is backed by rigorous evidence of effectiveness, and in implementing evidence-based interventions in their schools or classrooms. By intervention, we mean an educational practice, strategy, curriculum, or program. The Guide is organized in four parts:

I. A description of the randomized controlled trial, and why it is a critical factor in establishing "strong" evidence of an intervention's effectiveness;

II. How to evaluate whether an intervention is backed by "strong" evidence of effectiveness;

III. How to evaluate whether an intervention is backed by "possible" evidence of effectiveness; and

IV. Important factors to consider when implementing an evidence-based intervention in your schools or classrooms.