ose of this extended abstract is to present SE-Star, a Thales proprietary large-scale multi-agent simulator, together with the content of two scenarios, designed with the Paris Police Department, demonstrating its capabilities at offering powerful features for planning, decision-making and training in real-life scenarios. Categories and Subject Descriptors I.2.11 [Distributed Artificial Intelligence] Intelligent agents – Multiagent systems. General Terms Algorithms – Design – Experimentation – Human Factors – Performance – Security. Keywords Agent-based simulations – Human behavior simulations – Largescale simulations – Tools and environments.