Learning and development, for Lev Vygotsky, is explained in terms of his theory of the zone of proximal development (ZPD), which posits that learning precedes development in school age children Vygotsky believed that learning is not development;however, he also believed that properly organized learning results in mental development and sets into motion a variety of developmental processes that would not occur without the process of learning. He postulates that learning is a necessary and universal aspect of the process of developing culturally organized, specifically human psychological functions. And school learning, according to Vygotsky, introduces something new into a child's development