With Bärbel Inhelder, this man conducted the Three Mountains experiment. He also expounded upon the sociological, biological, and logical models of intellectual development in his theory of "genetic epistemology". This author of Biology and Knowledge wrote about a two-fold process of juvenile moral development in The Moral 
With Bärbel Inhelder, this man conducted the Three Mountains experiment. He also expounded upon the sociological, biological, and logical models of intellectual development in his theory of "genetic epistemology". This author of Biology and Knowledge wrote about a two-fold process of juvenile moral development in The Moral Judgment of the Child. He also gave a name to our understanding that, when something disappears from view, it isn't really gone. Besides "object permanence", this psychologist formulated a theory with stages like preoperational and sensorimotor, which are differentiated by their development of schema. Name this Swiss psychologist who studied albino sparrows and devised the cognitive theory of development.
With Bärbel Inhelder, this man conducted the Three Mountains experiment.
Jean {Piaget}