This popular practitioner guide and course text takes the reader step by step through diagnostic decision making in mental health. Acclaimed for both the clarity of his writing and his clinical expertise, James Morrison provides principles and decision trees for evaluating information from multiple sources and constructing a valid, clinically useful working diagnosis. More than 100 vivid vignettes–from the straightforward to the toughest cases–illustrate the practical application of these methods. Essential topics include developing a differential diagnosis and dealing with comorbidity. New to This Edition *Revised throughout for DSM-5. *Updated resources and suggested readings. See also Morrisons DSM-5(R) Made Easy, which explains DSM-5 diagnoses in clear language, illustrated with vivid case vignettes; The First Interview, Fourth Edition, which presents a framework for conducting thorough, empathic initial evaluations; and The Mental Health Clinicians Workbook, which uses in-depth cases and carefully constructed exercises to build the readers diagnostic skills.