The book presents author's concepts and technologies relating to the diversity of human characters, assessment of inclinations and abilities, characteristics of behavior and motives of people's actions. The book is addressed to everyone who wants to achieve harmony and mutual understanding in relations with loved ones. It will be useful both for those who are professionally engaged in psychological counseling, and for those who are simply interested in the possibilities of the young science of socionics: teachers, managers, managers of various levels, teachers and university students.