The Brigance Comprehensive Inventory of Basic Skills–II (CIBS-II) is a diagnostic battery intended for children in grades 1st through 6th. The aim of this study was to test for item invariance, or differential item functioning (DIF), of the CIBS-II across sex in the standardization sample through the use of item response theory DIF detection methods. Specifically, we studied two subtests—Reading Vocabulary Comprehension and Listening Vocabulary Comprehension. Form A exhibited a smaller degree of DIF compared to Form B across the two subtests. Thus, we recommend that Form A be the form of choice for practitioners.
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