“…Accordingly, the positive outcomes and behavior changes associated with extracurricular activity participation may reflect processes that were not considered. School- related factors (Barker & Gump, 1964;Chase, Jacobs, & Meredith, 1987;Eder, 1985Eder, , 1995Jacobs & Chase, 1989;Karweit, 1983;Kinney, 1993;Lindsay, 1984), family influences (Csikszentmihalyi, Rathunde, & Whalen, 1993;Fletcher, Elder, & Mekos, 1997;Jones & Offord, 1986, 1989Mahoney, 1998), and individual differences in motivations or aspirations (Clausen, 1993;Hymel et al, 1996;Pickles & Rutter, 1991;Vallerand, Fortier, & Guay, 1997) may each influence whether an individual becomes involved in school activities. These factors should be pursued in future research (Brown, 1988;Hultsman, 1992).…”