EXERCISE 21.1: CAT ONLINE REVIEW OBJECTIVE: To become familiar with IRT and CAT through an investigative of current adaptive tests.

BACKGROUND: In the module overview, we discussed the key elements of IRT and how it can be applied to CAT and DIF. We mentioned that many large-scale tests are now administered in an adaptive format. Many of these tests have detailed descriptions geared to test takers about the nature of the adaptive test process.