In the psychological model, the five-factor personality (FFM) an empirical investigation to measure the variables of the character. Based on this model, a character from the five main dimensions are formed that include: mental, hardship, etc. extroversion, etc. adaptations, embracing the experience, and the task of sociology.

Paul Costa, Jr., along with Robert, AR. Mac Carey in the 80's was a test with the name of the NEO-I invented that, that the three factors of the five factor character can measure. Then in 1985 ad, etc., by adding two factors, another test, NEO PI to measure the five-factor personality published. The final edit of this test in 1990 was published today, Revised NEO Personality Inventory, or NEO PI-R is called. Mass research the next in the total markers, it was that the five-factor wide enough, and Kara was.