The purpose of this project is to design, study, and evaluate a model afterschool program in which underrepresented fourth and fifth-grade youth work with UH undergraduate STEM majors to learn about engineering. The research on the program has two broad purposes: First, to study the participants (i.e., elementary school students, undergraduate mentors, undergraduate pre-service teachers, and male relatives), and second to evaluate the implementation and impact of the program on the elementary students.