Please note that these pages are no longer regularly maintained and, as a result, some of the information here is out of date. You might also be interested in visiting two of our related sites: the Personality Project provides additional and updated content on personality theory and the SAPA Project provides a free personality assessment that is based on modern personality models.
SAPA Project Test
How do people tend to think, feel, and behave--and what causes these tendencies? These are the questions addressed by personality theory and research.
This website deals with scientific research programs in personality psychology. They are offered as candidates for the title "great ideas"; whether they are indeed great remains an open question.