The go-to resource for clinical and forensic practice has now been significantly revised with 85% new material, reflecting the tremendous growth of the field. Leading authorities synthesize the state of the science on symptom feigning in cognitive testing and present evidence-based recommendations for distinguishing between credible and noncredible performance. A wide range of performance validity tests (PVTs) and symptom validity tests (SVTs) are critically reviewed and guidelines provided for applying them across differing cognitive domains and medical, neurological, and psychiatric conditions. The book also covers validity testing in forensic settings and with particular populations, such as ethnic and linguistic minority group members. New to This Edition *Numerous new authors, a greatly expanded range of topics, and the latest data throughout. *"Clinical primer" chapter on how to select and interpret appropriate PVTs. *Chapters on methods for validity testing in visual-spatial, processing speed, and language domains and with cognitive screening instruments and personality inventories. *Chapter on methods for interpreting multiple PVTs in combination. *Chapters on additional populations (military personnel, children and adolescents) and clinical problems (dementia, somatoform/conversion disorder). *Chapters on research methods for validating PVTs, base rates of feigned mild traumatic brain injury, and more.