2 MAJOR, BUT DIFFERENT, SYSTEMS OF WELL-FACTORED PERSONALITY-MEASUREMENT SCALES IN THE QUESTIONNAIRE MEDIUM ARE CURRENTLY AVAILABLE. 1, DEVELOPED BY GUILFORD AND HIS CO-WORKERS, IS AN ORTHOGONAL SERIES NOW PRINCIPALLY EMBODIED IN THE GUILFORD-ZIMMERMAN (G-Z) TEMPERAMENT SURVEY, WHEREAS THE OTHER SYSTEM, DEVELOPED BY CATTELL AND HIS CO-WORKERS, IS AN OBLIQUE SERIES TYPIFIED BY THE 16 PF TEST. AN OBLIQUE FACTOR ANALYSIS WAS USED JOINTLY ON THE 16 PF AND G-Z SCALES TO DETERMINE: (1) IF A GOOD, UNIQUE SIMPLE STRUCTURE RESOLUTION CAN BE ATTAINED IN CORRELATION MATRICES OBTAINED JOINTLY FROM SCALES ORIGINALLY FITTED TO ORTHOGONAL AND OBLIQUE FACTORINGS, AND (2) IF THE NATURAL SOURCE TRAITS REVEALED ARE THOSE CONCEIVED IN THE G-Z OR IN THE 16 PF. ATTEMPTS WERE MADE TO DETERMINE IF THE 2 SERIES OF SCALES OCCUPY THE SAME OR A DIFFERENT PERSONALITY SPACE AND IF MEANING COULD BE GIVEN TO ANY EXTRA DIMENSIONS FOUND. RESULTS YIELDED NATURAL SOURCE TRAITS WHICH, IN GENERAL, WERE THOSE PROPOSED BY THE OBLIQUE SCALES. THE CONTROVERSY BETWEEN PROPONENTS OF EACH SYSTEM AND PROPOSALS FOR FURTHER, MORE DEFINITIVE RESEARCH ARE CONSIDERED. (45 REF.) (PsycINFO Database Record (c) 2017 APA, all rights reserved)