Social interaction leads to the development of cognition.
Children do not develop in isolation. This applies equally to voluntary attention, to logical memory, and to the formation of concepts. All the higher functions originate as actual relationships between individuals. The zone of proximal development is the distance between the actual developmental level as determined by independent problem solving and the level of potential development as determined through problem solving under adult guidance or in collaboration with more capable peers. Implies that the child has internalized the knowledge and skills necessary to perform a particular task.