This study reports, for a group of 257 boys and a group of 286 girls, factor analyses of 43 Project TALENT aptitude and information tests, together with 48 tests from three multiple-aptitude batteries and one high-school achievement battery (The Flanagan Aptitude Classification Tests, Differential Aptitude Tests, General Aptitude Test Battery, and the Essential High School Content Battery). The subjects were high-school juniors when the Project TALENT tests were given in the spring of 1960, and seniors when the tests were administered the following fall. The subjects came from rural and suburban areas of Knox County, Tennessee. A section on factor analysis methodology is followed by sections giving the tests and samples, procedures, and results in detail, with descriptions of supplementary studies and comparisons with other studies. (BP)