The prevalence of individuals suffering from dementia is rising rapidly in Germany and worldwide. At the same time, dementia research is one of the most active fields in medicine and psychology. This volume provides guidance in this rapidly evolving environment regarding the causes, etiology, prevention, and diagnostics of dementia-related diseases. The authors examine dementia diagnostics in an interdisciplinary context: medical and neuropsychological methods are viewed not as competing but as complementary approaches. An overview of relevant aspects of the psychodiagnostic process in the field of dementia diagnostics is provided at the outset. In the following sections, dementia-related diseases and their diagnostic criteria are presented, along with explanations of their etiology, pathophysiology, and manifestations.