List of popular theories of psychology: 1. Piaget Theory of Development 2. Kohlberg’s Theory of Moral Development 3. Spearman’s Two-Factor Theory 4. Thurstone’s Multiple Factor Theory 5. Cannon’s Theory 6. The Psycho-Analytic Theory (Freud) 7. The Constitutional Theory (Sheldon). 1. Piaget Theory of Development: Stages of Intellectual Development: Piaget may be best known for his […]