It also helps children develop their thinking skills and use of language. The biggest difference between Piaget and Vygotsky is their assessment of a child's developmental progression. Piaget believes that development is individual; Vygotsky believes that development is largely based on social aspects. Piaget insisted that learning occurred after development, while Vygotsky believed that learning occurred before development could take place. Piaget's theory has four phases; Vygotsky assumed that there were no predefined steps, but only three elements. Both Piaget and Vygotsky believe that development can result from cognitive conflict. They agree that children learn actively; children learn quickly and their development declines with age. In both theories, teachers serve as facilitators and guides. Using Vygotsky's theory, educators are able to realize what a child is capable of doing with assistance and they can help them develop their skills on their own. They are engaged in the discovery process, but receive guidance from a more knowledgeable source. With Piaget's theory, he wanted children to learn and discover about themselves