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Promoting Social Development and Preventing Health and Behavior Problems during the Elementary Grades: Results from the Seattle Social Development Project

Abstract The Seattle Social Development Project (SSDP) is a longitudinal study of 808 multiethnic urban children sampled and surveyed at age 10 as they entered the fifth grade. The study includes a quasi-experimental test of a preventive intervention program. The SSDP was created by nesting an experimental intervention study, initiated at first-grade entry, within the larger longitudinal panel study. Eighteen elementary schools serving high-crime neighborhoods of Seattle were assigned nonrandomly to conditions and all consenting fifth-grade students in these 18 schools participated in the study. The SSDP intervention is grounded in the social development model, an integrated developmental theory of behavior. This paper summarizes the results through age 21 of the preventive intervention trial nested within the longitudinal study.