Self- and Observer Reports of Personality.

People's personality trait levels are often assessed by obtaining self-reports or observer (informant) reports on questionnaires (inventories). When the target person is closely acquainted with the observer-as in the case of spouses, close relatives, or close friends-several findings are obtained for full-length measures of the Big Five (Five-Factor Model) or HEXACO personality factors. First, mean scores tend to be comparable between self-reports and observer reports, although Openness to Experience tends to be higher in self-reports than in observer reports. Also, self/observer agreement (in the sense of convergent correlations) tends to be rather high, albeit somewhat lower for cooperation-related traits (HEXACO Honesty-Humility, HEXACO Agreeableness, Big Five Agreeableness) than for other traits. Finally, Openness to Experience and Honesty-Humility (and, to some extent, Big Five Agreeableness) show some degree of similarity and assumed similarity between closely acquainted persons.