The Center for Children and Technology (CCT) at Education Development Center, Inc., an international nonprofit research and development organization (cct.edc.org), conducted the formative evaluation of the fourth year of the Be A Scientist! (BAS) project. This project, managed by Iridescent—a nonprofit afterschool science, technology, engineering, and mathematics (STEM) program (www.iridescentlearning.org), has the goal of providing high-quality afterschool science and engineering courses to underserved families in New York City and Los Angeles. The project aims to enable participants to