The document discusses several theories of human development: 1) Psychoanalytic theory proposed by Freud focuses on unconscious drives and stages of psychosexual development. Erikson expanded on this with his eight stages of psychosocial development. 2) Behaviorism theory proposed by Watson emphasizes that all behavior is learned through conditioning principles like classical and operant conditioning. Bandura's social learning theory also notes the role of modeling and observing others. 3) Cognitive theory proposed by Piaget describes four stages of cognitive development and the processes of assimilation and accommodation to maintain cognitive equilibrium. 4) Sociocultural theory proposed by Vygotsky highlights the role of culture and social interaction in learning, including the zone of proximal development. 5