…http://… came up with his 18,000 traits based on their importance indescribing personality. Utilizing Allport’s research, Cattell formulateda questionnaire in which people rated themselves on several traits thatbest described them. This was called “factor analysis.” Another traittheorist, Hans Eysenck posited that a person can be described accordingto two sets of dimensions: introversion- extroversion and emotionality-stability. Finally, Costa and McCrae were dissatisfied with both Cattelland Eysenck whose traits were too many and too few respectively. Theircontribution to the trait theory was the Big Five. They used factoranalysis to formulate five traits: openness, conscientiousness,extraversion, agreeableness, and neuroticism.What is the main idea behind each of these four theories?How do trait theories differ from the theories studied last week?What is a major disadvantage of trait theories?Which theory takes into account external circumstances in predicting behavior?