The Keirsey Character Sorter is designed to identify different kinds of personality. It is similar to other devices derived from Carl Jung's theory of "psychological types," such as the Myers-Briggs, the Singer-Loomis, and the Grey-Wheelright. The questionaire identifies four temperament types: Guardian ["SJ"], Artisan ["SP"], Idealist ["NF"], and Rational ["NT"], each of the four types having four variants as follows:
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