This brief represents part 1 in a series on fostering the adoption of evidence-based practices in out-of-school time programs. The lag between discovering effective practices and using them "on the ground" can be unnecessarily long, sometimes taking 15 to 20 years! The purpose of this brief is to provide practitioners with a better understanding of evidence-based practice, and to share resources that can help bridge the research-to-practice gap and reduce the lag time between the identification and application of evidence-based practice. It defines evidence-based practice as the application of best available research evidence in the provision of health, behavior, and education services to enhance outcomes. This brief distinguishes between "evidence-based practice" and "evidence-based programs." It also presents an exhibit of online resources available for practitioners showing where to find evidence-based programs and practices. (Contains 9 endnotes.)