The working definition of personality means characteristic of the person that account for consistent patterns of feeling, thinking, and behaving. However, for the trait theorists, their definitions are quite unique. Gordon Allport states that the most important structures of personality are those that permit the description of the person in terms of individual characteristics. Thus, the basic unit of personality is personal dispositions, which he called ¡¥trait¡¦ and his personality was utilized the concept of personal dispositions.

Raymond B. Cattell defined personality as ¡¥that which permits a prediction of what a person will do in a given situations¡¦. This prediction can be measured and described by the source traits.

Hans J. Eysenck states that behavior can be considered in terms of specific responses that some of them are linked together and form more general habits. Groups of habits occur together to form traits. He defined traits as ¡¥important semi-permanent personality disposition¡¦ (

In contrast to strengths of trait approaches, limitation on approaches are also be concerned. First of all, Allport did little research to establish the existence and utility of specific trait concepts and substantiate that traits are hereditary. Although the functionally autonomous motives of psychologically healthy adults are covered, but what about the motives of children and of psychotic and neurotic adults?

In addition, trait theory does not explain personality change. It is one thing to document the stability of personality and to suggest reasons for such stability ¡V genetic factors, selection and shaping of situations, and stereotyped or self-confirming responses by others so future studies are recommended to study the personality change. The advance in technology increases opportunity in studying brain functioning, for example, DNA may have effect on personality development.

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Hans Eysenck, Bipolar Inventory¡¦, Research Method, OCEAN Five, Pervin John, Five Cultural, , According Goldberg¡¦s, Gordon Allport, Lewis Goldberg, individual differences, factor analysis, personality development, personality traits, trait theorists, source traits, dynamic traits, personal dispositions, surface traits, trait theory, personality inventory eysenck, inventory eysenck personality, basic unit personality, basic units personality, bond 1994 addition,