We present an approach to adaptive simulation based upon a stratified representation of the behaviour of entities. In previous simulation models, the adaptation of an entity's behaviour is defined prior to runtime, as the conditions they might encounter are completely specified. While entities are custom-made to function properly for particular situations, their behaviour could be inappropriate in other situations. We propose a behavioural model of adaptation which enables entities to modify their behaviour for a large variety of situations, and describe the implementation of the model for two simulations in a biological context. Application areas range from environmental simulation and ecological planning to psychological modelling and navigation simulation.
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