Publisher's Note Mental health professionals make reliable and valid judgements for some tasks, but not for others. What are the cultural and cognitive biases that lead to inaccuracy? How can clinicians learn to recognize and manage the blind spots that lead to faculty diagnosis and treatment? This book provides a comprehensive empirical investigation of when biases are likely to occur and recommends the use of non-intuitive decision aids to assure the validity of clinical judgments. A must read for all helping professionals.