1992'5, p.26
Sapogova E. E.
System model of sign-symbolic activity in preschoolers
(RESUME)

The system mode] of sign-symbolic activity's development in ontogenesis is offered. Its three stages are marked out: low level - replacement, middle level - modelling, and high one - mental experimenting, each characterized by qualitative peculiarities in idealized objectivity's construction. The central process for preschool age is modelling, which is studied experimentally. Original method "Buttons" was designed to study if senior preschoolers master the modelling and the means of it. The results show that about 70 % of senior preschoolers can compare modelled properties to known concrete ones.