Tangible explanations for structural changes in terrorism over time are missing. Furthermore, attempting to explain such changes as ideological is problematic in that it reinforces a tautology,...Show moreTangible explanations for structural changes in terrorism over time are missing. Furthermore, attempting to explain such changes as ideological is problematic in that it reinforces a tautology, considering that terrorism itself is often conceptualised as inherently ideological. Problematising the notion of ideology in the definition of terrorism and the typology of changes in terrorism, therefore, offers an exit from such continuous circular reasoning that focuses on ideology. A tangible change in terrorism is that from pack terrorism, i.e. group terrorism, to lone wolf terrorism. Three rival explanations potentially account for this change. An ideological explanation that focuses on the capability of ideology to spark violence, as well as a contextual explanation that argues that changes in the living environments of perpetrators lead to changes in the characteristics of terrorism, cannot stand firm when taken to the test. Meanwhile, a processual explanation according to which terrorist and counterterrorist forces continuously exploit the other side’s disadvantage does. Ultimately, changes in terrorism can be conceptualised using the analogy of a cat-and-mouse game in which learning and adaptation processes on the side of terrorists and counterterrorist forces likewise cause terrorism to change structurally.Show less