Item Response Theory

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• LEM: FREE IRT software from J. Vermunt
• Item Response Theory Resources from the University of Maryland
• Scientific Central International: Home of BILOG, MULTILOG and PARSCALE
• CAT Central: A Global Resource for Computerized Adaptive Testing
• Assessment Systems Corporation
• Jim Ramsay's TestGraf: Provides a graphical analysis of multiple-choice test items and/o responses using Ramsay's "kernel smoothing" approach to item response theory.
• David Thissen's Home page
• Lawrence Rudner's IRT site: Very Helpful