Book excerpt: Nation-states and violent nonstate actors (VNSAs)-- including terrorists and insurgents-- rely on positive perceptions (or at least acceptance) among key constituencies in order to muster support necessary for achieving their strategic objectives. As illustrated in the chapters of this volume, the information domain requires a sophisticated strategic communications ability in order to influence the policy and behavior of states as well as the hearts and minds of citizens. A core objective of this volume is to help develop a deeper understanding of this ongoing struggle for what some have called strategic influence, and particularly how states can counter the role that ideologies, the media and the Internet play in radicalizing new agents of terrorism.