Summary. Egress models are being used more frequently to simulate people movement; i.e. how people enter, use and leave a building. However, little has been written on the different aspects of people movement that can be examined and how these models may achieve this. This paper outlines six modes in which an egress model can be applied: Naïve; Operational; Predictive; Engineered; Real-Time; and Interactive. The paper outlines what is needed to enable these application modes, in terms of data, expertise and model functionality, and the benefits of doing so. This is intended to highlight the challenges faced by egress models and the complexities of the subject matter being examined: people movement under emergency and nonemergency scenarios. Currently, no model includes all of the six modes identified. The authors hope that this discussion will identify the importance of these modes, the need for them to be addressed within the same model and the clear benefits of doing so.

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