This is the last home visit in connection with the National Survey of Child Health; and its purpose is to bring the medical and social history up to date and to fill in gaps in our information about the child's progress at school and the job he / she will enter on leaving school. We are also asking about the parents' health including questions both on known illnesses and on their general well-being. This proves to be important in relation to the health and adjustment of their children. During the 15 years of this survey we have kept in touch with over 90 per cent of the parents and children. As the value of this inquiry depends on information being obtained for every possible survey child we hope that on this last occasion all forms will be completed.