conduct of quality research. These developments are discussed in Chapter 9, which also provides a bridge to Part III, New Frontiers, by outlining some of the methodological challenges and opportunities for the next generation of prevention research.

The evidence presented here has important practical implications for the practices of the schools, family service agencies, and health care providers that are involved at each stage of the development of young people. Taken together, the evidence shows that the nation could support the healthy development of many more young people.

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