The document summarizes three theories of socialization and the development of self: 1) John Locke's "tabula rasa" theory that humans are born without personality but acquire it through experiences and social molding. 2) Charles Cooley's "looking glass self" theory that people develop self-images based on how they imagine others see them and judge them. 3) George Herbert Mead's theory of "role-taking" where people internalize others' expectations and these become less important as one matures.