Abstract. Agent-oriented modelling of software systems and agent-based simulation are commonly viewed as two separate fields with different concepts and techniques. We show that the Agent-Object-Relationship (AOR) modelling language, proposed in [Wag03] for information systems analysis and design, can also be used for specifying simulation models that can be executed by an agentbased simulation system. The suitability of AOR modelling for simulation is also supported by the fact that the AOR meta-model and the meta-model of discrete event simulation can be combined into a model of agent-based discrete event simulation in a natural way.