The book offers a must-have tool primarily for psychiatrists, geriatricians, neurologists, and psychologists, but will also be of interest to general practitioners for first line assessment. The aim of this book is to establish a gold standard: a reference work to be used as a clinical guide to the assessment of mental illness in older persons in the field. Psychogeriatrics is generally a very specific field in the midst of different disciplines, where there is hardly a clinical consensus on how to best assess and treat elderly subjects with mental or behavioral symptoms, possibly resulting from psychiatric disorders. This book provides clear and practical indications, prepared by a panel of international experts in the field with extensive scientific and clinical experience. Boxes with first and second line actions for assessing and treating mental illness in the elderly are included, and all chapters are uniformly divided into sections on epidemiology, etiopathogenesis, differential diagnosis, assessment, and treatment.