A system for training of coordination and cooperation of decision makers in emergency management has been under construction for some time. A first prototype of the system was developed in the MUSTER system. The system is being developed modularly with one module for each of the suborganisations involved in the complete preparedness: fire brigade, police, medical team, civil defence, etc. All these modules will in the end be integrated on a common integration platform, either to a fully-fledged system covering all aspects of training for the complete preparedness, or for creating a dedicated system for specific training set-ups for specific groups of trainees. The first module completed as a commercial system, "Training of medical teams on site", will be presented.