As programmers try to reuse codes written by other programmers, a chain of fatal faults shall be made due to misunderstanding of the original intention, this is because of poor understandability to the relevant documents in software engineering, we also call it as an adverse software understandability, however, software understandability is the mental activity of programmers, so, it is not easy to be quantized or measured. Since internal mental activity is hardly visible to us, we are obliged to determine software understandability by the external visible artifact. We reviewed factors suggested by literatures to affect software understandability. Furthermore, this paper brings forward an integrated view to determine good or bad of software understandability at that time.
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