In June 2001 the National Academies and the Russian Academy of Sciences held a bilateral workshop in Moscow on terrorism in a high--technology society and modern methods to prevent and respond to it. The purpose of the workshop was to begin a dialogue on high--impact terrorism that could lead to further U.S.--Russian collaboration. This volume includes papers presented at the workshop by 31 Russian and American experts on various types of high-impact terrorism, including biological and agricultural terrorism, nuclear and electromagnetic terrorism, explosives, chemical, and technological terrorism, and cyber terrorism. The papers also address legal issues, Russian internal affairs, and the future of international cooperation in this area.