One reason classical test theory may be less than satisfactory as a basis for assessing reliability is that it requires that exactly the same test items be administered to each person. This means that for any particular examinee, only a handful of the test items will actually tap into his or her exact (unique) ability level. Yet the reliability estimate is for the entire test, including all the items that were too easy or too difficult for that particular examinee. a. Explain how tests are developed on the basis of item response theory (IRT). b. Describe the "overall result" of IRT-based procedures regarding test reliability. A. Check My Work