Panel subjects were followed and surveyed 15 times from grade 5 through age 39, with most completion rates above 90%. Students assented at each survey administration and consented to longitudinal follow-up when they turned 18. SSDP is a longitudinal study of 808 students who attended 18 public schools in Seattle, WA, and whose parents consented for their participation in longitudinal research when they were in grade 5 (77% of the eligible population in participating schools). Methods: Application of the SDM in the RHC intervention was tested in a quasi-experimental trial nested in the Seattle Social Development Project (SSDP). As such, this integrative paper provides one of the few examples of the power of theory-driven developmental preventive intervention to understand impact across generations and the power of embedding controlled tests of preventive intervention within longitudinal studies to understand causal mechanisms. While the original results of both model and intervention tests have been published elsewhere, this paper provides a comprehensive review of these tests. This paper reviews and integrates the tests of the SDM and the impact of RHC. The SDM was used to guide the development of a multicomponent intervention in middle childhood called Raising Healthy Children (RHC) that seeks to promote prosocial development and prevent problem behaviors. Purpose: This paper describes the origins and application of a theory, the social development model (SDM), that seeks to explain causal processes that lead to the development of prosocial and problem behaviors.
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