This document outlines several theories of psychosocial, cognitive, and moral development. It discusses Sigmund Freud's psychosexual stages of development from oral to genital. It also mentions Erik Erikson's psychosocial stages and how personality develops throughout the lifespan. Jean Piaget's theory of cognitive development and his four stages from sensorimotor to formal operations is summarized. Lastly, the document briefly explains Kohlberg's six stages of moral development from obedience to universal ethical principles.