The special educator must be aware of possible sources of error in assessment of children with learning problems. Sources of error can be attributed to unconscious examiner bias, ambiguous test responses, linguistic and cultural differences of the examiner and examinee, previous test-taking experience, and problems with test reliability and…

The purpose of this book is to make it possible for measurement specialists to solve practical testing problems through the use of item response theory (IRT). The topics, organization, and presentation are those used in a 4-week seminar held each summer for the past several years. The material is organized to facilitate understanding; all related…