The book from the perspective of psychoanalysis tells about the experience of applying attachment theory in clinical practice. The history of the origin of attachment theory is summarized, methods and results of scientific research on this problem are presented, as well as various approaches to the classification of so-called "attachment disorders." Scientific conclusions are supported by the description of individual indicative cases from clinical practice based on the material of medical histories of all age groups of patients. The final part of the book talks about the possibilities of fruitful practical application of knowledge on attachment theory in areas such as prevention, pedagogy, family and group therapy.