Believed that human beings learn through a hands-on approach to education; reality must be experienced.

Social interaction influences the process of cognitive development. Coined the term zone of proximal development.

Identified 8 stages of psychosocial development which have a positive or negative outcome for personality development if not reached.

Believed young children are driven by their instincts to learn, and created community based preschools under the principles of the Reggio Emilia approach to education. 

Proposed the social learning theory stating all behavior is learned through observation and modeling.

Developed a philosophy of education based on scientific observation of how children learn along with freedom, independence and respect for children.

First psychologist to make a systematic study of cognitive development, specifically in children. 

Behavior and actions are motivated by a hierarchy of human needs.

Expanded on Piaget's theory of moral development and theorized how morality grows overtime.

Broadened the scope and understanding of intelligence through his theory of multiple intelligence.