ABSTRACT
Lev Vygotsky's list of what develops in social pretend role play gives us a general idea about his approach to development. Vygotsky's description has been interpreted as a promise that all child's play promotes development. In order to track the changes of self-regulation in early childhood and plan appropriate interventions we have to follow the developmental trajectory of subjects in childhood activities. Playing children use imagination and create imaginary situations for play environment. Children construct social rules for play interaction. The history of the girls' relationships is that Lotta came to the children's group in the November of 2002, and at this point had known Liina and Noora for about six months. Successful joint manipulation of objects together with an adult changes to a child's striving for independent action. Vygotsky's hypothesis about interpersonal origin of new higher mental functions supports focusing on social relationships between individuals in the analysis of early childhood development.
