Constructivism can be traced back to educational psychology in the work of Jean Piaget (1896–1980) identified with Piaget's theory of cognitive development. Piaget focused on how humans make meaning in relation to the interaction between their experiences and their ideas. His views tended to focus on human development in relation to what is occurring with an individual as distinct from development influenced by other persons. Lev Vygotsky's (1896-1934) theory of social constructivism emphasized the importance of sociocultural learning; how interactions with adults, more capable peers, and cognitive tools are internalized by learners to form mental constructs through the zone of proximal development.