the validity of the factor structure of the 16pf questionnaire (the 16 primary factors and 5 global factors) has been supported by more than 60 published studies (cattell & krug, 1986; conn & rieke, 1994; hofer and eber, 2002). research has also supported the comprehensiveness of the 16pf traits: all dimensions on other major personality tests (e.g., the neo personality inventory, the california psychological inventory, the personality research form, and the myers-briggs type indicator) have been found to be contained within the 16pf scales in regression and factor-analytic studies (conn & rieke, 1994; cattell, 1996).