Construct Validity of Selected Subtests of the ITPA

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Abstract
Six subtests of the Illinois Test of Psycholinguistic Abilities (ITPA) were matched with parallel tasks which were equivalent to the subtests except in one dimension of the test's theoretical model. A total of 16 subtests and tasks were administered to 126 third grade children who met the same criteria used to select the original ITPA standardization sample. The data were factor analyzed using a principal components solution. Seven factors emerged and accounted for 66 percent of the variance. Each of the ITPA subtests loaded highly on only one factor. In addition, the subtests loaded with the other related tasks on factors which are clearly identifiable in terms of the model regarding level, process, and channel.

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