The document summarizes several stage theories of development, including: - Erikson's psychosocial stages of development from infancy to late adulthood. - Piaget's stages of cognitive development from sensorimotor to formal operations. - Vygotsky's views on social interaction and the zone of proximal development influencing cognitive growth. - Kohlberg's stages of moral reasoning development from obedience to universal ethical principles. - Gilligan's perspective that female moral development emphasizes caring and relationships more than males.