The idea that validity should be considered a property of inferences, rather than of assessments, has developed slowly over the past century. In early writings about the validity of educational assessments, validity was defined as a property of an assessment. The most common definition was that an assessment was valid to the extent that it…

This text on the assessment of students with disabilities focuses on accuracy in assessment and testing and the need for functional and meaningful assessment practices. The 14 chapters are grouped into 4 major parts. The first part, "An Introduction to Assessment," describes a comprehensive evaluation and discusses the mandatory…