H. HAFNER Schizophrenia Research Unit, Central Institute of Mental Health, Mannheim, Germany The present volume contains the lectures and invited discussions of the sympo sium on "Risk and protective factors in schizophrenia - towards a conceptual model of the disease process," which was held at the International Science Forum of the University of Heidelberg from October 25 to 27, 200l. They are supple mented by a "Summary and outlook," in which Peter Jones gives a brief overview of the results and perspectives featured in the presentations and discussions. The contributions and discussions...