You can see and touch and feel a physical thing. Oftentimes, you can understand from looking at a physical thing how it works. Moreover, it's frequentlybut not alwaysthe case that your conceptual model of a physical thing corresponds to its actual operation and attributes, and we generally equate the absence of such correspondence to "bad" design . It's relatively easy to understand how to use a physical item and how to prolong its use and how to reclaim it for another purpose. You can't see, touch, or feel software. Oftentimes, it's difficult to understand from looking at software how…
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