The initiative called Integrating Science Into Afterschool: A Three-Dimensional Approach to Engaging Underserved Populations in Science set out to promote science learning in three out-ofschool settings (afterschool programs, home, and community), to promote rich and varied science experiences to underserved Philadelphia communities, and to assess the value of this model for the broader field of out-of-school time and informal learning in science, technology, engineering, and mathematics (STEM). The project was funded through the National Science Foundation’s Innovative Technology Experiences