A stratified adaptive test of verbal ability has been built by use of 280 vocabulary items with known parameters. The test was designed to measure ability in broad range. Administrations of the test and an additional questionnaire on the test indicate that the test was appropriate for 6th graders through graduate students. An ability score of each subject was estimated by the maximum likelihood method. An information curve for the set of items answered by each subject showed that appropriate items were selected for the subject, The curve of the amount of information has maximum value at the neighborhood of the estimated level of his ability. All these results demonstrated that this stratified adaptive test could be used for measuring broad range of verbal ability.