This paper developed a personal-computerized adaptive test (CAT) in order to measure verbal ability of students from junior high school to university. In the first half, to create an item pool, six forms of a verbal ability test were adminisitered to 3922 subjects. One hundred and eighty-six items were selected from the six forms through a classical item analysis, and calibrated by the Rasch model. In addition, the difficulty estimates were equated to the metric of existing item pool ; then, the present item pool consisted of 346 items. In the middle stage, BASIC program for the CAT was created, and its practical flaw were revised with the help of opinion of university students and cognitive psychologists. In the second half, first and second experiments using test-retest and split-half techniques, administered the CAT to 80 subjects and demonstrated the high reliability of measurement of the CAT. Furthermore, the third experiment validated the CAT procedure through the administering of the CAT and a fixed-form test to 51 subjects.