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“Zooming-IN” Modelling Method for Managing Complexity

Abstract Complex systems modelling is characterized by the often painful decision regarding to what extent abstraction can be carried on without loss or distortion of the facts due to oversimplification. This article looks at a dynamic systems modelling approach that allows incorporating high and low levels of detail, while maintaining intact the overall behaviour of the system. Although this infringes on the paradigms of systems theory, it is an effective tool provided some guidelines are observed. Although the approach appears intuitive and is perhaps not entirely new, it has not received the formal status of a modelling technique because it is difficult to formalize. This work draws attention to it by its constraints rather than by its novelty. It is illustrated through the case study of an economic system in a systematic cause-effect approach. The model uses control systems techniques and agents that interact with each other.