The book is a reference book on the theory and methods of providing psychological assistance to people both directly during an extreme situation and at its remote stages. Various aspects of the work of a psychologist in the outbreak of an extreme situation are analyzed. They include currently known psychological intervention techniques, as well as a set of recommendations for survival in extreme situations and methods of providing first aid to victims. Methods of psychological work with the consequences of extreme situations and work with post-traumatic stress disorder are described. This reference book is, first of all, a collection of techniques, or more precisely, exercises that a psychologist (psychotherapist, consultant) can use in his practical work.