Abstract: A large inter-organizational Swedish crisis management exercise was carried out during two months in 2011. It was unique in the sense that it combined both short-term and long-term crisis management involving more than 60 organizations and 6000 participants. This has never been done before in this context and therefore required an elaborated and sophisticated exercise concept. The purpose of this paper is to present the concept of the exercise as well as lessons learned about the concept and the Swedish crisis management system. The exercise was composed of three different phases each involving different methods with respect to exercising and evaluating effective and efficient crisis management. The general conclusion is that the exercise enabled analyzes and handling of both short-term and long-term crisis management. This implies that the exercise concept could be of great use in Sweden and other countries where emergencies call for cooperation between numerous distributed organizations. © 2012 ISCRAM.