By Scott Stewart The terrorist tradecraft discussed in last week's Security Weekly does not happen in isolation. The practitioners of terrorist tradecraft conduct their activities in the midst of other people — the authorities attempting to identify them and thwart their plans as well as civilians. Terrorist tradecraft also does not remain static. It is constantly evolving. These changes are prompted not only by countermeasures put in place to prevent terrorist attacks but also by advances in technology — a powerful force that can serve to either nullify old tradecraft practices or to provide new tools to the purveyors of terror. Terrorism is an enduring reality . While geopolitical changes may cause a shift in the actors who employ terrorism as a tactic, terrorism will continue to be used no matter what the next geopolitical cycle brings .