Practical and comprehensive, this is the first book to focus on noncredible performance in clinical contexts. Experts in the field discuss the varied causes of invalidity, describe how to efficiently incorporate validity tests into clinical evaluations, and provide direction on how to proceed when noncredible responding is detected. Thoughtful, ethical guidance is given for offering patient feedback and writing effective reports. Population-specific chapters cover validity assessment with military personnel; children; and individuals with dementia, psychiatric disorders, mild traumatic brain injury, academic disability, and other concerns. The concluding chapter describes how to appropriately engage in legal proceedings if a clinical case becomes forensic. Case examples and sample reports enhance the book's utility.