"Terrorism and responses to terrorism have repeatedly had a profound influence in shaping human experience. A terrorist incident was the detonator setting off the cataclysmic First World War explosion; terroristic violence was one of the important elements within the anti-colonial reshaping of global politics during the twentieth century; responses to the September 2001 terrorist attack on the USA defined much subsequent international politics; terrorism has frequently been deployed by states against their own and other peoples; and the mutually-shaping intimacy of non-state and state violence, together with the often agonising legacies emerging from that terrorising relationship,"--