Abstract
An Arabic modified version of the Otis-Lennon Mental Ability Test was administered to 400 boys and girls in secondary school. Their ages ranged from 15 to 23 years ( M = 16.2 yr., SD = 1.4). The validity and reliability of the test were estimated according to the classical model and the Rasch model and adequate evidence of validity and reliability were obtained, supporting the efficiency and the suitability of the test as a measure of mental ability in the Arab culture.
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