Abstract
Over the past twenty years there has been a rapid growth in the provision of special schools for educationally subnormal children. Between 1953 and 1962, for example, the number of pupils attending special schools for the E.S.N. rose from 19,000 to 36,000 but there were still 10,000 children awaiting admission on the latter date (Ministry of Education, 1963). The E.S.N. population is different both quantitatively and qualitatively from the mentally deficient group of children of pre-war days, yet we have surprisingly little knowledge of the general characteristics of this growing section of the child population.