L.S.Vygotsky's views on child development science

Article analyzes main content of L.S. Vygotsky's forth lecture «Problem of environment in paedology» in the context of the whole cycle of seven lectures in course «Basics of paedology» and in the context of other L.S. Vygotsky's works on the same subject. These lectures are viewed as a L.S. Vygotsky's project on science and theory on child development. The forth lecture mainly focuses on principles specific for mental development. Here Vygotsky was developing a new concept of child's environment, where environment should be considered relativistically, dynamically and «through experience». It is shown that ideas from this lecture were more closely developed in his work «Problem of age» and in lectures on age crises.