The final two articles, by Zarrett et al. (2009) and Linver, Roth, and Brooks-Gunn (2009) address the reality of youth-organized activity participation and the fact that some youth who participate in sport also participate in other activities, whereas some youth focus exclusively on sport. Each study drew on a large, longitudinal database. Linver et al. used cluster analysis, identifying five specific youth activity clusters. Findings revealed that the sports plus other activity cluster had the most positive outcomes, although participating only in sport yielded more positive outcomes than did an absence of activity involvement. The research also indicated that activity participation cluster interacted with academic risk for competence, connection, and character outcomes.