The National Partnerships for Afterschool Science (NPASS) Project was led by The Center for Science Education (CSE) at Education Development Center, Inc. (EDC) in Newton, MA in partnership with the Lawrence Hall of Science (LHS) in Berkeley, CA, with funding from the National Science Foundation (NSF). The NPASS project approach relied on a professional development training and mentorship model to build the capacity of community-based organizations (CBOs) to lead high-quality, hands-on science and engineering activities in their afterschool programming. An overarching project research question