Bringing together experts in the field, this comprehensive volume presents the state of the art in evaluating noncredible performance in clinical contexts. The varied causes of invalidity are discussed and the applications, strengths, and limitations of widely used performance and symptom validity tests reviewed. Chapters address validity assessment with specific populations, including military personnel, children, and individuals with dementia, psychiatric disorders, mild traumatic brain injury, academic disability, and other concerns. The book discusses how to proceed when testing is invalidated, as well as how to appropriately engage in legal proceedings if a clinical case becomes forensic.