As the industrial world grows more complex, virtual environments have proven to be interesting tools to train workers to procedures and work situations. To ensure learning and motivation, a pedagogical control of these environments is needed. However, existing systems either do not provide control over running simulations, limit user agency, need the authors to specify a priori all possible scenarios, or allow for incoherent behaviours from the simulated technical system or the virtual characters. We propose in this paper a model for a dynamic and indirect control of the events of a virtual environment. Our model aims to ensure the control, coherence, and emergence of situations, in virtual environments designed for training in highly complex work situations.