Piaget's theory of cognitive development proposes that children progress through four discrete stages of development: sensorimotor, preoperational, concrete operational, and formal operational. At each stage, the child demonstrates new cognitive abilities. Kohlberg's theory of moral development also outlines six stages through which individuals progress: obedience and punishment, individualism and exchange, interpersonal relationships, maintaining social order, social contract and individual rights, and universal principles. Both theories posit that development occurs through progressive stages and is influenced by biological maturation and experience.