![]() ![]() The results of this investigation, and a further testing sample of adolescents, adults and middle school age pupils, led to the development of the NEO-PI-3. In 2002, the NEO-PI-R was tested on over 1,900 high school pupils. Subsequently, they published the Revised NEO Personality Inventory (NEO-PI-R). In 1985, they published a manual for the test which included all five traits.īy 1992, Costa and McCrae had developed six facets for each of the five traits, totaling 30 facets in all. In 1978, they published the original version of the test based on these three personality traits, NEO-PI.įurther investigation by Costa and McCrae discovered two more personality traits, agreeableness (A) and conscientiousness (C). Using the recognized personality traits of neuroticism (N) and extraversion (E), they discovered a third personality trait, openness (O). The development of NEO-PI began in the 1970s with psychologists Paul Costa and Robert McCrae’s investigation into how personality changed with age.
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