The retrofit of an existing process is a complex and lengthy task.Therefore,a tool to support the retrofit by reasoning about the existing process and the potential areas of improvement could be of great help.A proposal for a retrofit approach based on a multi-modelling knowledge representation is presented in this paper.The use of structural,behavioural,functional and teleological models allows the designer to work with a combination of detailed and abstract information depending on the retrofit step.The proposed retrofit process consists of four steps:data extraction,analysis,modification and evaluation.The HEAD and AHA! prototype systems were implemented for the two initial steps.These systems have been applied in a case study to the ammonia production process.
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