Routine outcome measures are essential to chart individual patient progress and evaluate models of service provision. The Health of the Nation Outcome Scales (HoNOS) were commissioned by the Royal College of Psychiatrists as a simple, brief measure for this purpose. It is one of the most widely used outcome measures in mental health services globally and has been translated into at least seven languages. Its use has broadened beyond its original purpose and in several countries collection of HoNOS data is mandatory. We review 585 potential articles to chart the development and evolution of HoNOS, as well as its psychometric properties, qualitative attributes and uses in clinical practice and research. The potential barriers to implementation of HoNOS on a wide scale are considered and its future role in evaluating effectiveness and benchmarking of services are discussed.