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The Digital Twin is more than just a descriptive model or collection of related digital information (e.g., a SysML model). It is a complete physical description including all behaviors.
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CIMdata defines the Digital Twin as a physics based description of a system resulting from the generation, management, and application of data, models, and information from authoritative sources across the system s lifecycle.
Digitalization the use of digital technologies to change a business model and provide new revenue and value producing opportunities; it is the process of moving to a digital business (Gartner)