The Detroit Tests of Learning Aptitude, 3rd Edition (DLTA-3) is a battery of 11 subtests that measure different but interrelated mental abilities. These are clinically assessed by the battery, which further attempts to delineate the factors that contribute to Spearman's factor for general intelligence. The DLTA-3 has age norms expressed for test takers ranging from 6 years, 11 months to 17 years, 11 months in terms of scaled score units. With respect to different target groups (Blacks, Whites, Hispanics) group information is provided only in the form of reliability coefficients. The DLTA-3 appears to be relatively unbiased with respect to reading measurement. Testing of verbal aptitude is tailored in terms of concepts most children would know. The analysis attempts to differentiate higher and lower levels of processing among students on several important theoretical dimensions of intellectual development. The motoric subtests have been revised since the DLTA-2, contributing to the fact that DLTA-3 is a good test for measuring intraindividual information processing differences because of its high internal consistency. (Contains 5 references.) (SLD)