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A Working Model shouldn't just sit there looking pretty like a picture. It should  actively control the process that it represents - to which it connects.

For example, The factory and warehouse at right were real projects.:
The factory example displays live status of a machine making parts, with simple green-yellow-red indicators like traffic lights. The warehouse example displays live inventory across time, showing shipping, receiving and onhand quantities. 

Simple pictorial graphics like these, instead of screens full of numbers, facilitate recognition of status and problems - increasing productivity, stability and safety.

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