Improving the quality of out-of-school time activities and creating effective learning environments is of keen interest to practitioners, funders and policymakers. Funded by The William Penn Foundation, "Quality Time After School" identifies characteristics of after-school activities that are linked to youth engagement and learning across a rich diversity of out-of-school-time activity areas. Drawing from surveys and interviews with more than 400 participants and instructors from five Philadelphia-based Beacon Centers, the report's findings highlight the importance of two features of high-quality activities: good group management and positive adult support of learning. Building on analyses of over 50 detailed activity observations, as well as key lessons from past research, the report also suggests a road map for program operators and policymakers to create engaging learning environments in after-school programs. (Three appendices are included: Methodological Overview; (2) Quantitative Analysis; and (3)Philadelphia Beacon Activities Included in the Study. Contains 17 endnotes and 16 tables.)