Why is international counterterrorism so difficult? This article argues that international counterterrorism is practically impossible in the absence of interorganizational coordination. Unfortunately, interorganizational coordination does not arise spontaneously. The current “war on terrorism” is based largely on political partnerships, but political partnerships are neither necessary nor sufficient conditions of interorgani-zational coordination. Instead, managers should develop externally oriented cultures and cooperative institutional objectives, which, ideally, should be accountable to international institutions. Results from a controlled experiment within a topically designed simulated environment support the argument.