Abstract
The opportunity to conduct a prevalence study of psychiatric disorder among young adolescents arose because a Family and Community Project had been established in Blackburn and the neighbouring town of Accrington. This Project, which is under the direction of Dr. G. Rose, aims to study the causes and possible methods of prevention of delinquency. As part of the survey, the secondary school population had been screened by means of questionnaires given to parents, teachers, and the children themselves, and this provided the starting point for the study described here.