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Latent growth curve analysis was used to examine the structure and interrelations among aggression, drug use, and delinquent behavior during early adolescence. Five waves of data were collected from 667 students at three urban middle schools serving a predominantly African American population, and from a more ethnically diverse sample of 950 students at four rural middle schools. One set of models focused on changes in individual behaviors; the other on changes in a global problem behavior factor. Models with separate growth trajectories for aggression, drug use, and delinquent behavior provided the best fit for both samples and revealed relations between initial levels of aggression and subsequent changes in the other behaviors. Boys and girls differed in their initial levels of these behaviors, but not their patterns of change. Differences in growth curve trajectories were found across samples. These findings have important implications for assessment and prevention of problem behaviors in adolescents.

This article is guided by several premises. First, community coalitions fit with a social ecology perspective of health promotion because they work with multiple domains and promote community change. Second, the community context affects the functioning of coalitions. Third, key leaders are an important part of the social fabric of a community and influence the social ecology of a community; therefore a coalition should include key leaders and influence them and their organizations. The purpose of this article is to advance an understanding of the social ecology of coalitions by describing concepts, variables and results from two national studies and by providing anecdotal evidence and a measure of key leaders from our own work. After briefly defining and describing community coalitions, we: (1) review literature on contextual variables and community coalitions, (2) provide examples of contextual variables influencing community coalition development, and (3) discuss the relationship of key leaders in multiple domains and community coalitions. The article concludes with a discussion of the need for a framework of contextual variables and a promising next step.