personal development in the process of choosing a profession, professional education and training, as well as productive performance of professional activities. Professional formation is a heterochronic process, in some of its periods there are declines and jumps (peak achievements), conflicts and crises depending on the interaction of factors of individual, personal and professional development. In this individual integral process, it is possible to distinguish stages characterized by the social situation and leading activity (see Stages of professional development in Chapter 2.10. Key Psychological Concepts in Work Psychology).