Since the end of the 1920s, thousands of studies have been conducted on the influences of media violence, especially its influences on children and youth. Many of the research findings would appear to be conflicting. There are, moreover, different types of media violence and different types of influences. In this document, Cecilia von Feilitzen, Scientific Co-ordinator at Nordicom’s International Clearinghouse on Children and Violence on the Screen, has attempted to collect and classify research findings into a more concise form than is perhaps common when reporting on research. We hope that this document will answer some of the questions so often asked by various groups in society.