A young child and her father are playing with a shapes toy. The young child alone cannot figure out how the various shapes can fit into the designated holes. Her father describes how each shape can only fit into its same shaped hole. The father offers her encouragement and helps her put a few pieces in their respective hole. As the child grasps the concepts, the father allows her to complete the task alone. This is an example of interaction influencing the cognitive development of a child. This lesson will focus on these social interactions and their impacts of cognitive development, according to the psychologist, Lev Vygotsky.