Theories, Models, and Factor Approaches to Personality, Temperament, and Behavioral Types: Postulations and Measurement in the Second Millennium A.D.

The chronology and historical developments in postulating theories, models, and factor approaches to personality, temperament, and behavioral types are discussed as they occurred during the 20th century A.D. The measurement of these models and approaches is from an historical perspective with a focus on the precursors of the five factor approaches that are currently the most commonly accepted ones today. The early beginnings dating back 2,500 years are also briefly discussed.