description Paul Costa Overview
Paul T. Costa Jr. is an American psychologist known for research on personality traits, adult development, and aging. In a long collaboration with Robert R.
McCrae, he helped develop the five-factor model of personality and the NEO Personality Inventory, which measures neuroticism, extraversion, openness, agreeableness, and conscientiousness. Their work provided widely used tools and evidence for studying personality structure and stability across the lifespan.
insights Ranking position
Paul Costa ranks #39 of 228 in the Psychologist ranking, behind Kent Berridge, ahead of Albert Ellis.
help Paul Costa FAQ
What personality test did Paul Costa help develop?
Paul Costa and Robert McCrae developed the NEO inventories for measuring broad personality traits and their narrower facets. The revised NEO Personality Inventory became a major assessment associated with the five-factor model.
What are the five traits in Costa and McCrae's model?
The five domains are neuroticism, extraversion, openness to experience, agreeableness, and conscientiousness. They are often remembered with the acronym NEOAC or the reordered acronym OCEAN.
Did Paul Costa claim that adult personality never changes?
No, Costa's longitudinal research emphasized substantial rank-order stability, meaning adults often retain their relative position compared with peers. Average trait levels can still change with age, and individuals can change because of experience or intervention.
How is the NEO inventory different from the Myers-Briggs Type Indicator?
The NEO measures continuous trait dimensions grounded in the five-factor model rather than assigning people to paired personality types. The Myers-Briggs Type Indicator instead sorts preferences into categories such as introversion versus extraversion.
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