These numbers reflect the cyclical nature of most crime and terror patterns. A problem appears, develops, and matures, subsiding only when security agencies establish successful efforts at prevention and response. Cooperation among nations in counterterrorist measures is one source of the decline that reduces the number of safe havens and destroys the infrastructure of many terrorist organizations. The jailing of terrorist leaders has probably been the most important reactive government effort. Nevertheless, sometime in the future, the violence is likely to escalate again. To limit terrorist attacks against United States targets, governments and businesses must have an effective intelligence network and maintain programs in security awareness and target hardening. List of 10 suggested readings