For the past three weeks we have been running a series in the Security Weekly that focuses on some of the fundamentals of terrorism. First, we noted that terrorism is a tactic not exclusive to any one group and that the tactic would not end even if the jihadist threat were to disappear. We then discussed how actors planning terrorist attacks have to follow a planning process and noted that there are times during that process when such plots are vulnerable to detection . Last week we discussed how one of the most important vulnerabilities during the terrorism planning process is surveillance, and we outlined what bad surveillance looks like and described some basic tools to help identify those conducting it.