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.