The article proposes a model of the “subject of one’s own activity” as the highest level of development of students’ subjectivity; the totality of subjectivity in cognition, action, communication, as well as reflexivity. Psychological mechanisms of realization of the activity content of education by means of research and project activities of students are considered. The functions of reflexive types of activity are defined — research, project work, construction, organizational management and strategizing in the formation of psychological neoplasms of students at different age stages. Five stages of the formation of students’ subjectivity in the practice of scientific and practical education have been established, the leading mechanisms of the development of subjectivity through inclusion in a motivating educational environment have been identified.

The article is devoted to the topical topic of the formation of subjectivity in the implementation of a developed collective-conjugate (having a common goal, but different means for different participants) activity in a child-adult community. The specific features of reflexive types of activity — research, project activities, construction, organizational management, as well as strategizing as a mechanism for the formation of transcendental reflection on these types of reflexive activity — are analyzed and determined. The structure of the developed collectiveconjugate human activity as a synthesis of different types of reflexive activity is revealed. The need for a person to master these types of activities and ways of combining them at different stages of movement towards the goal for the formation of the highest level of his subjectivity — the subject of his own activity is substantiated.