The symposium focused on some problems and issues in the assessment of human personality traits and was planned around a research study being conducted by Educational Testing Service under contract with ONR. The study is trying to provide a service to researchers who are working (through the use of factor analysis) toward a theoretical basis in the personality domain. The idea for preparing the Proceedings developed in the course of the actual symposium. Included in the Proceedings are papers by: Lewis R. Goldberg, The Exploitation of the English Language for the Development of a Descriptive Personality Taxonomy; John W. French, The Identification of Personality Factors from a Systematic Review of the Literature; Diran Dermen, Verification Study of 28 Self-Report Personality Factors; and Raymond B. Cattell. Factor Reference Kits and Personality Structure Theory. Also included in the Proceedings are comments by the two discussants: Joseph R. Royce and Donald W. Fiske.