The child and adolescent version of the Health of the Nation Outcome Scales (HoNOSCA) represents the first attempt at a routine outcome measure for Child and Adolescent Mental Health Services in the U.K. Extensive field trials suggested that the scales were both acceptable to clinicians from the various disciplines working in this area and also valid and reliable. A growing number of services are now using the scales in audit and research, supported by the national HoNOSCA base that provides training and co-ordinates further developments.