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Item Response Theory (IRT) offers many potential advantages to test developers and consequently is being used increasingly in language testing, not only by researchers but also by practitioners. However, as use has increased, so has the potential for misuse, as the effects of violating IRT assumptions are still not well understood. Choi's research thus marks an important milestone in language testing, as it is the first study to systematically examine empirically the relative appropriateness of three widely-used IRT models to language proficiency tests. His findigs have important implications for both language testing researchers and for practitioners who may want to utilize IRT in test development. (Lyle, F. Fachmann, University of California, Los Angeles)

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The Author: Inn-Chull Choi earned a Bachelor of Engineering in industrial engineering at Korea University, Seoul, Korea. He earned a Master of Arts in TESL at the Division of English as a Second Language of the University of Illinois at Urbana-Champaign. He majored in language testing during his doctoral study in SLATE (Second Language Acquisition & Teacher Education) in the Department of Educational Psychology at the same institution. He is currently a lecturer at Korea University and an editor of the College English Teachers Association of Korea, and a member of Teachers of English to Speakers of Other Languages and of the National Council on Measurement in Education. His areas of research interest include language testing and computer assisted language learning.

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