Who knows a product better than its producer?55 And where, if not in the sys-tem with which a plant was developed, is the data on this most precise and comprehensive?56 A compressor manufacturer, for example, no longer sells the system, but the compressed air.57 It operates the sub-system itself; its know-how, manifested in the data model, is a guarantee for quality and reliability.58 The burden on the overall plant operator is significantly relieved and it is more likely to continue to rely on this supplier in the future.