An important challenge for the Department of Defense (DOD) science and technology (S&T) programs is to avoid technological surprise resulting from the exponential increase in the pace of discovery and change in S&T worldwide. The nature of the military threat is also changing, resulting in new military requirements, some of which can be met by technology. Proper shaping of the S&T portfolio requires predicting and matching these two factors well into the future. Some examples of technologies which have radically affected the battlefield include the Global Positioning System coupled with...