Celebrating the 115th anniversary birth of P.Ya. Galperin, an outstanding Russian scientist, and paying tribute to his contribution in general psychology, genetic psychology and teacher-training psychology, it is necessary to emphasize Galperin’s unique approach to the essence of mental phenomena and processes, to the mechanisms and development that reverberate the internal integrity and systemic approach. There are at least, three main directions of P.Ya. Galperin’s concept, i.e. his system of psychology. The first direction is the method of gradual development of intellectual activity for studying human mental activity. The second direction is the study of the theoretically described and actually implemented process of gradual development of intellectual activity as a psychological reality. The third direction is the gradual development of intellectual activity in the practice of teaching.

This paper is devoted to the strategic issues of implementing gradual development of intellectual activity. The significance of these assumptions for practical training, not in a laboratory experiment, but in the mass version, paradoxically requires a far deeper and broader understanding of mechanisms of the human mental activity than academic laboratory research. The reasons for the relatively limited use of Galperin’s theory are considered in the practice of training. Further development of psychology along the path outlined by P.Ya. Galperin aimed at enhancing practical capabilities of the theoretical approach is being highlighted.