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The extent to which auditory and visual channel part-score means differ typically was studied by reference to the performance of 962 average children in the normative sample of the Illinois Test of Psycholinguistic Abilities. A standard error of measurement difference of 1.87 scaled score points was obtained, such indicating comparatively little difference in the mean performance of average children on the two communication channels of this test. Differences between means of auditory and visual channels greater than 3.09 or 4.36 scaled score points are presented as statistically significant at the 5 or 1 percent level of confidence, respectively. Significant part-score differences suggest atypical performance in the channel with the lesser mean scaled score and may indicate the presence of a disability among behaviors assessed by subtests within that channel.