Strategic Information Warfare reports on the findings of an exercise-based analysis of the information warfare problem. The RAND team was joined in this study effort by senior exercise participants from the national security community and the information system and telecommunications industries. Multiple groups of participants went through a series of CyberWar exercises based on a methodology known as "The Day After..." - which was originally developed by RAND to explore a variety of emerging nuclear proliferation threats and related counterproliferation issues. Using this same methodology, the authors identify the defining features of strategic information warfare, discuss the implications for strategic defense, and recommend a set of potential initiatives to minimize the likelihood of a cyberspace warfare crisis. Strategic information warfare is a very new concept. It is the emerging face of CyberWar - a phenomenon that once was largely hypothetical.