Objective: This paper evaluates a range of properties for a clinician-based instrument designed for routine use in a child and adolescent mental health service (CAMHS).

Method: The Health of the Nation Outcome Scales for Children and Adolescents (HoNOSCA) is a new outcome measure with great promise. Case vignettes were used to examine interrater reliability. HoNOSCA was implemented for routine outpatient use by multidisciplinary staff with a return rate of 84%. The 305 ratings obtained at assessment were analysed by age, gender and diagnosis. A sample of 145 paired ratings with a 3-month interval were examined for the measurement of change over time.

Results: Interrater reliability of the total score indicates moderate reliability if absolute scores are used and good reliability if the total score is used for relative comparisons. Most scales have good to very good reliability. The scales discriminated between age and gender in the expected way. HoNOSCA correlated with clinicians' views of change and was sensitive to change over a 3-month period. The total score seemed a proxy for severity.

Conclusion: Routine outcome instruments must be explored in settings where they will be used and with realistic training. HoNOSCA appears to be of value in routine outcome measurement and although questions remain about reliability and validity, the results strongly support further investigation.