Michael Treier gives an overview of the importance, the legal basis and the methods of risk assessment of mental stress. This has been mandatory since the amendment of the Occupational Safety and Health Act with regard to the explicit consideration of psychological factors in the risk analysis. The essential presents aids to action, instruments and recommended procedures that allow a meaningful risk assessment of mental stress in all organizational forms. The second edition takes into account current regulations and laws as well as further developments in the content of the risk assessment of mental stress. Expanded infographics provide a quick overview of relevant content. An update on methods and tools completes the revised edition.