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Summary The results of our longitudinal, prospective research programme to date suggest that, as a first step, peer‐rated aggression and withdrawal constitute a useful broad‐based behavioural index of early problems related to psychopathology. The findings at this point also support our expectation that this index may serve as a fruitful criterion of vulnerability to schizophrenia in adulthood. Finally, as a screening procedure, the assessment method generated by this approach appears to be an effective means by which children in need of treatment or preventive intervention programmes may be identified.
Schwartzman et al. (Mon,) studied this question.