David W. answered • 10/27/15
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Extra info on the term "bug": In the early days of computers, Grace Murray Hopper found a moth in the circuitry of the computer. It had shorted the electrical circuits and caused the computer to fail. She taped the moth to her log book and used the term "bug" to describe the problem. [note: this was not first use of the term "bug" this way]
A "bug" is a flaw in the implementation of the design. Often, it is rather easily corrected, once it is found. For example, if you designed a chemistry or medical experiment and did not adequately clean the equipment or the air, that might change the results. The correction would be to more carefully follow instructions or to add a note to the instructions that cleaning is very important.
A design flaw happens when a solution does not adequately solve the problem. It often means that this solution will never produce the correct result. For example, you might choose 22/7 or 3.14 to estimate the value of Pi, but if you are manufacturing collapsing telescopes or curtain rods, the diameters must be somewhat more accurate, so you need a more precise value for Pi.
Rosan G.
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10/31/15
Michael J.
10/27/15