A study was conducted in order to investigate the factor structure of the Graduate Record Examinations (GRE) Aptitude Test, which now includes an analytical module. Comparison of the factor structures of the Aptitude Test before and after modification suggested that the factor structure of the verbal and quantitative sections of the test has been relatively unaffected by changes made in order to introduce the analytical module. The restructured test does, however, have a distinct, identifiable analytical dimension that is strongly related to the verbal and quantitative dimensions underlying performance on the test. Separate analyses of the analytical section of two forms revealed dimensions in the analytical items, particularly in the "analysis of explanations" item type, that may have practical value for test development activities. A look at another analytical item type, "evaluation of evidence," being considered for inclusion in future forms of the Aptitude Test, suggested that the ability to answer these items depends more on general reading comprehension ability than on analytical ability as it is now measured in the restructured test. Extension of factor solutions to various background variables, such as major field of study, yielded additional evidence supporting the discriminant validity of the verbal, quantitative, and analytical factors found in the test. (Author)