A ciples, refinement, and applications have always been a focus of study. Disability and rehabilitation are primary areas where exceptions to rules, practices, applications, and interpretations frequently occur. One reason is that the majority of assessment tools were developed for and normed with nondisabled individuals. This has resulted in the establishment of a large body of instruments for which intact physical, sensory, and cognitive functioning is presumed and necessary for interpretation. Thus, in trying to bring the resources of psychological assessment to individuals with a disability, a particular challenge exists across virtually all traditional domains of assessment.The challenge, for each type of assessment, can be summarized by several basic questions. First, what instruments are appropriate for a given disability? What research exists to inform the choice? What considerations are there in applying and interpreting a particular type of assessment for individuals with a disability? Finally, what might be some appropriate modifications if a given measure is not strictly suited to an individual with a disability? The need for answers to these questions is the underlying rationale for this book.