Second, if we do not maintain this correspondence between the data and information about the physical object and the physical object itself, then the only way that we can obtain that data and information is by actually possessing the physical object. But this is something we have gotten away from. If we walked into the office of the chief engineer 30 years ago, we would see an office filled with parts. This was the informational database. He or she did not need correspondence—the physical object itself was present. However, if he or she wanted to acquire or reacquire information about the physical object, the chief engineer had to expend time and energy to do so. It had to be sent it back to the lab to be disassembled, measured, weighed, etc.If we walk into the chief engineer’s office today, the chances are that we will find a computer screen in his or her office, but very few actual parts. If the correspondence between a physical object and its informational description is corrupted, lost, or did not exist in the first place, the ability to know about that physical object is greatly diminished.Parts reuse is to a great extent driven by correspondence. If correspondence does not exist, then an engineer is going to design a new part instead of using an existing part. If the information about a part does not exist, then the only way an engineer knows it exists is having access to the actual part itself, something that is becoming increasingly rare as engineering goes global and manufacturing takes place far from the design engineers.
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