Sullivan insisted in Interpersonal Theory of Personality that personality is shaped almost entirely by the relationships we have with other people.

Karen Horney’s psychoanalytic social theory, assumes that social and cultural conditions, especially during childhood, have a powerful effect on later personality.

Carl Jung believed that people are extremely complex beings who possess a variety of opposing qualities, such as introversion and extraversion, masculinity and femininity, and rational and irrational drives.

Rogers carefully crafted his person-centered theory of personality to meet his own demands for a structural model that could explain and predict outcomes of client-centered therapy. However, the theory has implications far beyond the therapeutic setting.

Skinner believed that human behavior, like any other natural phenomena, is subject to the laws of science, and that psychologists should not attribute inner motivations to it.