Simulation-based training in complex decision making often requires ample personnel for playing various roles (e.g. team mates, adversaries). Using intelligent agents may diminish the need for staff. However, to achieve goaldirected training, events in the simulation as well as the behavior of key players must be carefully controlled. We propose to do that by using a director agent (DA). A DA can be seen as a supervisor, capable of instructing agents and steering the simulation. We explain and illustrate the concept in the context of training in on-board fire fighting. Keywords. Virtual Training, Intelligent Agents, Simulation, Director Agent, Scenario Based Training