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While there are a number of theories about how personalities develop, Freud’s remains one of the most well-known and controversial. Freud tied the ability to function well as an adult directly to childhood experiences. More specifically, individuals go through stages, which can be navigated successfully or not, from birth to adulthood. If an individual becomes stuck, or fixated, in any one stage, Freud thought that future problems could erupt that would require the attention of psychoanalysis therapy to resolve.