Trait Theory Trait theorists believe personality can be understood by positing that all people have certain traits, or characteristic ways of behaving. A trait is an identifying characteristic, habit or trend. Saying that a trait is either present or absent does not accurately reflect a person's uniqueness, because according to trait theory all of our personalities are actually made up of same traits. We differ only in the degree to which each trait is expressed. Cattell believed it necessary to sample a wide range of variables to capture a full understanding of personality. The first type of data was life data, which involves collecting information from an individual's natural everyday life behaviors. Experimental data involves measuring reactions to standardized experimental situations and Questionnaire data involves gathering responses based on introspection by an individual about his or her own feelings. Using this data Cattel performed factor analysis to gene
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