Anyone who's called upon to address a problem and the relative sense of confusion associated with it, above all those who do so in a professional capacity, must have at least a basic knowledge of the underlying psychology. In fact, in order to effectively perform one's own institutional role, as well as any unforeseeable tasks that may be imposed by the specific circumstances, it is crucial to have a certain familiarity with the basic principles of this discipline, which marks a borderline between the rigidity of the exact sciences and the flexibility of the social sciences. This book is dedicated at all those working in the field of security, emergency and risk management, including: engineers, psychologists, public authorities, armed forces personnel, para-medical staff and health workers, Civil Protection personnel, Firefighters, etc.