Item Response Theory 101: Assessing Candidate Ability

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In the testing world, mention of Item Response Theory (IRT) conjures up images of cutting-edge, state-of-the-art practices needed for a program to be seen as modern and valid. The purpose of this white paper is to provide an introduction to IRT using nontechnical language. Since IRT is such a big topic, this white paper will focus on how IRT can be used to assess test-taker ability.