A commentary raises concerns that the approach used by the researchers might lead to the potentially premature conclusion that there is little evidence to support preventive school-based initiatives. It notes limitations of the research such as a disconnect between the Institute of Medicine's definition of prevention and the manner in which prevention programmes are typically evaluated, it did do not report other outcomes that might been improved by the interventions, and effective approaches for prevention might have been excluded, such as programmes targeting bullying, mental health promotion programmes, and programmes to help students manage the consequences of a specific event (e.g. parental divorce). It calls for the development of the evidence base to ensure that only interventions that have proven benefit are able to enter these somewhat unregulated new mental health environments.