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Due to the emission targets of the near future engines which are currently under development have to be equipped with high sophisticated electronic engine management systems (EMS). The calibration of an EMS needs more and more expensive development capacities because of the steadily increasing number of parameters which have to be adapted with respect to the individual engine behaviour. Under that circumstances computer based systems for automatic parameter optimisation become most urgent. The special requirements to such a system are the following: reduction of development time by using effective optimisation strategies better test bench utilization creating a reproducable optimised parameter set by application of exact mathematical algorithms This paper describes a system for automatic parameter optimisation called VEGA, which was developed by Carl Schenck AG in close cooperation with FEV Motorentechnik.