Abstract: The author performs a literature search on the topics of risk assessment, dangerousness, aggression, and violence in order to determine an evidence-based approach to risk assessment of patient violence towards others. This is set in the context of possible expansion in the scope of practice of mental health nurses, and the prevalence of nurses being assaulted by patients. In the absence of reliable and valid nursing risk assessment measures, the approach suggested here focuses on the use of observation skills to detect behaviour antecedent to physical assault, and the ability to adapt evidence to specific clinical settings.