The consistency by which shared abilities are assessed on three intelligence tests was investigated. Instruments under consideration include: the Wechsler Intelligence Scale for Children-Revised, the Kaufman Assessment Battery for Children, and the Stanford-Binet Intelligence Scale-Fourth Edition. A list of shared abilities and the subtests measuring them was developed for each test. Of the 52 shared abilities, 15 (29%) were measured by all three tests, 9 (17%) were measured by two of the tests, and 28 (54%) were measured by only one instrument. These results are presented in a table that lists the subtests of each instrument and which abilities are measured by each. The consistency by which shared abilities are measured was analyzed by nature of the stimulus (verbal, visual, or a combination of the two), mode of response (verbal or non-verbal), and task demands of the subtests. Of the 15 shared abilities measured by all three tests, only one is measured by subtests in which the nature of the stimuli and response mode are the same and in which there are no differences in the nature of the tasks. The analysis of each shared ability is presented along with a discussion of the results of the analysis. Guidelines and precautions in the use of shared ability analysis across tests are presented. (Author/TJH)