2013 sees the centenary of Jaspers' foundation of psychopathology as a science in its own right. In 1913 Karl Jaspers published his psychiatric opus magnum - the Allgemeine Psychopathologie (General Psychopathology). Jaspers was working at a time much like our own - with rapid expansion in the neurosciences, and responding to the philosophical challenges that this raised. The idea inspiring his book was very simple: to bring order into the chaos of abnormal psychic phenomena by rigorous description, definition and classification, and to empower psychiatry with a valid andreliable method to ass