Since 2013 the David P. Weikart Center (Weikart Center) and National Summer Learning Association (NSLA) have been collaborating on a project to improve the quality of summer learning programs. The work is now in its third phase, and this Interim Report provides evaluation findings and recommendations for year-one of the two-year project. The overall evaluation is focused on improving the intervention design, benchmarking implementation fidelity at scale in high capacity systems, and documenting program and classroom level innovations in the quality of instruction.