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The Test Of Knowledge About Epilepsy (KAE) is a disguised indirect measure of attitudes toward persons with epilepsy consisting of 20 error-choice test items requiring respondents to select one of four incorrect alternatives. To hide the true purpose of the test, 20 items of general knowledge about epilepsy are interspersed with the error-choice items. Study #1 involved the development of the KAE and psychometric analyses of prototype KAE data from a sample of 406 respondents. Results indicated satisfactory item characteristics, adequate reliability and homogeneity, and preliminary support for the measure's construct validity. In Study #2, analyses of data from a revised KAE obtained from a second sample of 325 respondents substantiated both the adequacy of the instrument's psychometric characteristics and its construct validity. The concurrent and discriminant validity of the KAE were supported by analyses of the associations of the KAE with a summated-rating direct measure of attitudes, a measure of social desirability responding, and measures of respondents' sociodemographic and experiential attributes. The KAE may be useful as a supplement to more traditional direct measures for the investigation of human-service providers' attitudes toward persons with epilepsy.