The interaction between a teacher and students creates a zone of proximal development. The zone of proximal development (ZPD) is the difference between what a learner can do without help and what he or she can do with help. It is a concept developed by Soviet psychologist and social constructivist Lev Vygotsky (1896 - 1934). The zone of proximal development (ZPD) of a child is not a naturally existing phenomenon that arises by itself every time an adult helps a child achieve greater independence. It is a special form of interaction in which the action of the adult is aimed at generating and supporting the child's initiative. Vygotsky among other educational professionals believes the role of education to be to provide children with experiences which are in their ZPD, thereby encouraging and advancing their individual learning.