1. State terrorism refers to violence directed against enemies, domestic or foreign, by a government or quasi-government actors. It is often the most organized and far-reaching form of terrorism. 2. Dissident terrorism involves non-state groups using violence against a government or other groups. It can be revolutionary, seeking large-scale change, or subrevolutionary, seeking smaller changes. 3. Terrorism cells operate with a horizontal command structure and autonomy, allowing them to lay dormant for long periods before acting. Richard Reid was convicted of attempting to blow up an airliner and was believed to be part of al-Qaeda's cell network.