Draw the System Boundary First
Define a digital twin boundary around a system-of-interest before modeling begins.
Before adding fidelity, decide what system the twin is responsible for. Name the system-of-interest Use a noun phrase that can be inspected in the real world: "packaging line 3 changeover," "chiller loop B," or "robot cell weld quality." Avoid slogans like "factory intelligence." A named system makes every input, output, and owner traceable instead of letting the twin become a vague enterprise aspiration. Separate interfaces from scope Weather, ERP orders, and operator shifts may affect the twin without being inside the twin. Treating every influence as inside scope makes the model impossible to own. Interfaces still need contracts: which signal…
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