“…Existing empirical research also underscores the benefit of the intensity and continuity of participation in OST programs for adolescents' academic achievement in secondary school and college (Darling, 2005;Gardner, Roth, & Brooks-Gunn, 2008;Mahoney & Vest, 2012;Morris, 2016). In addition, students' participation in OST programs, regardless of its focus on STEM or other subject matters, is associated with their expectancy-value beliefs of postsecondary education and STEM career, such as students' expectancy of success and further education (Mahoney, Larson et al, 2005;Morris, 2016), interest in academic matters, postsecondary education, and a career in STEM fields (Dabney et al, 2012;Price et al, 2018;Young et al, 2016), and self-efficacy in STEM-focused and other subjects (Dabney et al, 2012;Larson, 2000;Mahoney, Larson, et al, 2005;Morris, 2016). As such, in the present study, we treated the aspiration to STEM fields and choosing a STEM major in college as culminating events of students' long-term participation of OST programs during secondary school.…”