Sigmund Freud's stages of psychosexual development is one of the best known personality theories, but also one of the most controversial. According to Freud, personality develops through a series of childhood stages during which pleasure-seeking energies become focused on certain erogenous areas. This psychosexual energy, or libido, was described as the driving force behind behavior. Learn more about the stages of psychosexual development.

Related:

• Sigmund Freud Biography
• Sigmund Freud Timeline
• The Conscious and Unconscious Mind