Trait Theory of Personality: The Big Five Test

The trait approach to personality is one of the major theoretical areas in the study of personality. The trait theory suggests that individual personalities are composed broad dispositions. Consider how you would describe the personality of a close friend. Chances are that you would list a number of traits, such as outgoing, kind and even-tempered. A trait can be thought of as a relatively stable characteristic that causes individuals to behave in certain ways.
Unlike many other theories of personality, such as psychoanalytic or humanistic theories, the trait approach to personality is focused on differences between individuals. The combination and interaction of various traits forms a personality that is unique to each individual. Trait theory is focused on identifying and measuring these individual personality characteristics.

Raymond Cattell’s Sixteen Personality Factor Questionnaire

Trait theorist Raymond Cattell reduced the number of main personality traits from Allport’s initial list of over 4,000 down to 171,³ mostly by eliminating uncommon traits and combining common characteristics. Next, Cattell rated a large sample of individuals for these 171 different traits. Then, using a statistical technique known as factor analysis, he identified closely related terms and eventually reduced his list to just 16 key personality traits. According to Cattell, these 16 traits are the source of all human personality. He also developed one of the most widely used personality assessments known as the Sixteen Personality Factor Questionnaire (16PF).

Eysenck’s Three Dimensions of Personality

British psychologist Hans Eysenck developed a model of personality based upon just three universal trails:

1. Introversion/Extraversion:
   Introversion involves directing attention on inner experiences, while extraversion relates to focusing attention outward on other people and the environment. So, a person high in introversion might be quiet and reserved, while an individual high in extraversion might be sociable and outgoing.
2. Neuroticism/Emotional Stability:
   This dimension of Eysenck’s trait theory is related to moodiness versus even-temperedness. Neuroticism refers to an individual’s tendency to become upset or emotional, while stability refers to the tendency to remain emotionally constant.
3. Psychoticism:
   Later, after studying individuals suffering from mental illness, Eysenck added a personality dimension he called psychoticism to his trait theory. Individuals who are high on this trait tend to have difficulty dealing with reality and may be antisocial, hostile, non-empathetic and manipulative.⁴

The Five-Factor Theory of Personality

Both Cattell’s and Eysenck’s theory have been the subject of considerable research, which has led some theorists to believe that Cattell focused on too many traits, while Eysenck focused on too few. As a result, a new trait theory often referred to as the "Big Five" theory emerged. This five-factor model of personality represents five core traits that interact to form human personality.⁵ While researchers often disagree about the exact labels for each dimension, the following are described most commonly:

1. Extraversion
2. Agreeableness
3. Conscientiousness
4. Neuroticism
5. Openness

Assessing the Trait Approach to Personality

While most agree that people can be described based upon their personality traits, theorists continue to debate the number of basic traits that make up human personality. While trait theory has objectivity that some personality theories lack (such as Freud’s psychoanalytic theory), it also has weaknesses. Some of the most common criticisms of trait theory center on the fact that traits are often poor predictors of behavior. While an individual may score high on assessments of a specific trait, he or she may not always behave that way in every situation. Another problem is that trait theories do not address how or why individual differences in personality develop or emerge.