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Multidimensional item response theory (MIRT) is a relatively new methodology for modeling the relationships in a matrix of responses to a set of test items. MIRT has been used to help understand the skills required to successfully respond to test items, the extraneous examinee characteristics that affect the probability of response to items (DIF), and the complexities behind equating test forms, among other applications. This paper provides a short introduction to the historical antecedents of MIRT, the initial development of MIRT procedures, the similarities of MIRT procedures to other analysis techniques, and potential future directions for MIRT.
Mark D. Reckase (Sat,) studied this question.