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An integrated systems approach for the modeling of infrared instruments for the next generation telescopes

We survey the current status of the modelling and simulation process and its resulting products in current day groundbased astronomical instrument developments whilst highlighting the areas where improvements can be made. There follows a description of a novel integrated systems approach for modelling, as used by the European Extremely Large Telescope (E-ELT) EAGLE instrument team for the development of a Multi-Object Infrared Spectrometer. Also illustrated in this paper is how to use and record the simulation results early in the development cycle of an instrument in such a way as to contribute to the verification of the overall instrument performance.