The Children's In-patient Department of the Maudsley Hospital has now been running for two years, and currently accommodates twenty to twenty-five in-patients of both sexes. These range through severe organic disabilities, early cases of delinquency or behaviour disturbances and emotional or psychoneurotic problems. In the under fives there are a high proportion of acute disturbances of behaviour and habits. It is believed that our experience in developing this unit and discussion of our problems solved and still to be met will prove of value to other hospitals planning similar accommodation.