The release of the newest Sixteen Personality Factor Questionnaire (16PF), Fifth Edition, is the evolution of Raymond Cattell's conceptualization of the primary components of personality by analyzing adjectives describing human behavior. This updated version continues to measure the same 16 primary personality factors with improved reliability and validity. The 16PF Fifth Edition also includes five global factors. The face validity of the instrument is excellent. Norms were created with a final normative sample of 22,5000, and test-retest coefficients have offered evidence of stability over time of the traits measured by the 16PF. The wide use of the 16PF includes applications in industry and business for selection of personnel. The instrument is ideal for the school professional dealing with adolescents with adjustment problems and for advising students going to college. The 16PF is also being explored as a screening management tool for professional military personnel. (Author/SLD)