Blending history, decision theory, and mathematical modeling, Gartner argues that military personnel do reevaluate their strategies and that they measure the performance of a strategy through quantitative, "dominant" indicators. But different actors within a government use different indicators of success: some will see the strategy as succeeding when others see it as failing because of their different dominant indicators. Gartner tests his argument with three case studies: the British shift to convoys in World War I following the German imposition of unrestricted submarine warfare; the lack of change in British naval policy in the Battle of the Atlantic following the German introduction of Wolf Packs in World War II; and the American decision to deescalate in Vietnam after the Tet Offensive. He also tests his approach in a nonwar situation, analyzing the Carter Administration's decision to launch the hostage rescue attempt. In each case, his dominant indicator model better predicts the observed behavior than either a standard-organization or an action-reaction approach.