Raymond Cattell's research proposed a two-tiered personality structure with sixteen “primary factors” (16 Personality Factors) and five “secondary factors”.
Hans Eysenck proposes biological mechanisms as driving traits. Eysenck’s theory: three traits - extraversion, neuroticism and psychoticism.
Modern behaviour genetics researchers have demonstrated a clear genetic substrate to them.
Building on the work of Cattell and others, Lewis Goldberg proposed a five-dimension personality model, the “Big Five”: OCEAN or CANOE:
* Extraversion (outgoing and stimulation-oriented vs. quiet and stimulation-avoiding),
* Neuroticism (emotionally reactive, prone to negative emotions vs. calm, imperturbable, optimistic),
* Agreeableness (affable, friendly, conciliatory vs. aggressive, dominant, disagreeable),
* Conscientiousness (dutiful, planful, and orderly vs. laidback, spontaneous, and unreliable),
* Openness to experience (open to new ideas and change vs. traditional and oriented toward routine).
Holland Codes (John L. Holland's RIASEC vocational model) proposes six personality traits that lead people to choose their career paths.
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