The purpose of the present study was to evaluate twenty putative factor hypotheses (PFH's) of personality using various rotation methods, both orthogonal and oblique. In order to obtain a representative item pool, the literature was surveyed, with special attention to factor analytic studies. The test sources provided 1726 non-repeated items, from which 400 items, representing 20 PFH's, were selected. A balanced questionnaire consisting of items reworded for general consistency of presentation and answer format was administered to a cross-continent sample from which 1003 complete data sets were obtained. Factoring of 401 variables was carried out by principal axis method followed by four rotation procedures: two orthogonal, two oblique. Results across the various solutions indicated the following factors: Sociability (SY), Adjustment-Emotionality (AE), Dominance (AD), Superego (SG), Hypochondriac-Medical (HM), Impulsiveness (IP), Cooperativeness-Considerateness (CC), Inferiority (IF), Persistence (PS), Trust vs. Suspicion (TS), General Activity (GA). In addition, other factors were found, which although of lesser variance, have been reported in the literature.