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Discusses the complex variables that contribute to psychological vulnerability-genetic and developmental factors, ill health, inadequate environments, malfunctioning families, social disadvantages, etc.-with the aim of prevention emotional disorders. Articles by international authorities examine the emotionally sick child and his susceptibility to emotional disorders, as well as screening devices for detecting vulnerable children, their development through home and school, modulating the risks to which they are exposed, and preventive measures appropriate to different stages of development.