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On your third key difference (P.5), you are absolutely right, the connections become so important. Also, it’s not just the built asset that needs to be represented: it must include the taxonomical representation of safety, operational and environmental risks and how they interact with the built environment. In the Common Information Model we have been building for Intelligent Infrastructure programme at Network Rail we have included provision for modelling how these types of influence generically apply to classes of asset and how they may influence individual assets over time to alter asset performance and capability.