“…All of these theories have in common the postulate that the actions of a state in the international system can be partially explained by domestic variables (bureaucracies, decision-makers and social actors), or that they can be constrained by formal or informal international institutions (treaties, norms, organizations, and so forth). In volume 31, for example, preoccupations Promoting the Hegemonic Paradigm about the "war on terrorism" prompted the authors to consider terrorists as important actors in the international system (Cronin, 2006;Kydd and Walter, 2006;Abrahms, 2006;Byman, 2006;De Nevers, 2007). There is thus a clear tendency toward diversification of what constitutes a threat to security.…”