This work is intended both as a comprehensive review and discussion of the major studies on language development and functioning in mentally retarded persons since the 1950s, and as an exploration of a number of important issues in this field.

This book is intended both as a comprehensive review and discussion of the major studies of language development and functioning in mentally retarded (MR) persons over the last fifty years, and as an exploration of a number of important issues in this field.*The use of the term 'mental retardation' is in line with the recommendations of the American Association on Mental Retardation and other relevant organisations.