A perspective: risk analysis as a tool for reducing the risks of terrorism.

The destruction by terrorists of the twin towers of the World Trade Center and major damage wrought to the Pentagon on September 11, 2001, followed closely by the bioterrorist anthrax attacks via the mails raised the question of whether risk analysis might have a place in defending the United States against terrorist attacks. After first reviewing the multifaceted nature of terrorism and the reasons it is likely to become endemic in world society in the long term, just as other areas of crime are endemic, this article surveys several fields of risk analysis, finding possible short- and long-term uses of risk analysis. The areas chiefly considered are: risk communication and chemical, biological, and technological risk analysis. Broad policy and other uses are also considered. The author finds that risk analysis has already played some role, perhaps informally, but he sees the possibility for a much larger, formal one, a role that is centrally important for the present and future of the United States and the world.