Terrorism is not a unique phenomenon. It is merely a tactic of political violence to achieve a political end. An examination of past insurgencies reveals terrorism as a tactic to produce effects against the ruling government or the populace. Defining success in the war on terrorism requires an understanding of both the insurgent and terrorist operational environment in order to determine success criteria. Dr. Max G. Manwaring developed a theory on counterinsurgencies through an examination of 43 post World War II insurgencies. Manwaring's paradigm provides a model, which is applicable to measuring success in the war on terrorism.