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In this video I describe several approaches to narrowing down personality traits into a manageable number of ways of thinking about how people differ. These include Gordon Allport's hierarchy of cardinal dispositions, central traits, and secondary traits, the use of factor analysis and Raymond Cattell's 16PF test for source traits, and Hans Eysenck's two (and later three) dimensional model of Introversion/Extraversion and Neuroticism (and later Psychoticism).

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