(Piaget)concluded that intellectual development is the result of the interaction of hereditary andenvironmental factors. As the child develops and constantly interacts with the world around him, knowledge is invented and reinvented. His theory ofintellectual development is strongly grounded in the biological sciences. He saw cognitive growth as an extension of biological growth and asbeing governed by the same laws and principles. Piagetarguedthat intellectual development controlled every other aspect of development - emotional,social, and moral.