The book is a psychological study (diagnosis) of the main groups of human qualities in the structure of a real character. The author proposes the “seven radicals” technique, which is the result of refraction of the generally accepted theory of character through his own professional experience. Seven main human radicals are presented - hysterical, epileptoid, paranoid, emotive, schizoid, hyperthymic and anxious. Each of these radicals is considered according to the following scheme: general characteristics, appearance, qualities of behavior, behavior management and features of communication. The book is intended for specialists working with people: psychologists, doctors, teachers, specialists in the field of human resource management, as well as for everyone who are interested in applied psychology.