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+The first term I want to define, is failure.
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+A failure is an observable incorrect behavior of the software.
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+It is conceptually related to the behavior of the
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+program, rather than its code. The second term I want
+
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+to introduce is fault, which is also called bug.
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+And the fault or bug, is an incorrect piece of
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+code. In other words, a fault is related to
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+the code. And is a necessary, but not sufficient condition
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+for the occurrence of a failure. The final
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+term I want to introduce is, error. Where an
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+error is the cause of a fault. It is
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+usually a human error, which can be conceptual. A
+
+13
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+typo or something along those lines. And know that
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+this terminology, failure, fault and error, is the official
+
+15
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+[UNKNOWN] terminology. So you cannot go wrong if you
+
+16
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+use it. Now, let me illustrate the difference between
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+failure, fault and error. Using a small example. What I'm showing here is
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+a small function that, as you can see from its name, takes an
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+integer parameter i. And is supposed to double the value of i, and
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+return it. As we can clearly see, this is not what the function does.