Changing Youth in a Changing Society begins with a complete survey of the problems of youth, showing which disorders peak during the teenage years. With this background of fact firmly established, Michael Rutter turns to the difficult historical questions about whether adolescent disorders are truly becoming more frequent. Here Rutter shows that the news is not uniformly bad. Some psychosocial problems, such as teenage alcoholism and crime, are still on the rise. But other problems, among them the much heralded generation gap, turn out to be largely mythical. Still others, like the decline in educational achievement, may only reflect historical changes in the population of teenagers being assessed.

Rutter’s historical analysis supports a comprehensive discussion of the causes of adolescent disorder. The effects of heredity, childhood, family, school, peer group, religion, the media, and the urban environment are all assessed in review of research which is a model of clarity and good sense. This review provides the factual framework for informed recommendations for more effective prevention and treatment of adolescent disorders.

The Relationship Code is the report of a longitudinal study, conducted over a ten-year period, of the influence of family relationships and genetic factors on competence and psychopathology in adolescent development. The sample for this landmark study included 720 pairs of same-sex adolescent siblings—including twins, half siblings, and genetically unrelated siblings—and their parents.

Using a clear expressive style, David Reiss and his coinvestigators identify specific mechanisms that link genetic factors and the social environment in psychological development. They propose a striking hypothesis: family relationships are crucial to the expression of genetic influences on a broad array of complex behaviors in adolescents. Moreover, this role of family relationships may be very specific: some genetic factors are linked to mother–child relationships, others to father–child relations, some to relationship warmth, while others are linked to relationship conflict or control. The specificity of these links suggests that family relationships may constitute a code for translating genetic influences into the ontogeny of behaviors, a code every bit as important for behavior as DNA-RNA.