Keirsey Temperament Sorter II online instrument and Myers–Briggs Type Indicator (MBTI) for 203 college freshmen were analyzed and compared. Positive correlations appeared between the concurrent MBTI and Keirsey measures of psychological type, giving preliminary support to the validity of the online version of Keirsey. See also Analytical psychology Carl Jung Eduard Spranger, author of Types of men Ernst Kretschmer Five temperaments Four temperaments Socionics Temperament Type theory References External links Keirsey Temperament Website Personality typologies Personality tests