X: INTEGRATIVE SUMMARY.

In thismonograph, we have examined the development of a large number of adolescents from diverse socioeconomic and racial/ethnic backgrounds. Overall, these young Americans showed much stronger evidence of positive than problematic development, even at their most vulnerable times. Absolute levels of their engagement in healthy behaviors, supportive relationships with parents and friends, and positive self-perceptions and psychological well-being were much higher than their angry and depressive feelings, engagement in risky behaviors, and negative relationships with parents and peers. We did not find much evidence that adolescence is a time of heightened risk. Rather, most of these adolescents experienced relatively stable and developmentally healthy trajectories across a wide range of beliefs, behaviors, emotional functioning, and relationships, with slight increases or decreases at different points in development that varied across domains. That said, however, some developmental periods were riskier than others, depending on the outcome assessed as well as the gender and race/ethnicity of the adolescent. An examination of the entirety of adolescence (ages 12–20) allows us to pinpoint when, on average, such changes occurred.