Changeablity is one of the difficulties of development of software, the software will be continuous changes according to the change of technology, changing customer requirements, the resulting error due to the change of the other part. The software will bear a lot of pressure in changing, so the software developers have to withstand the pressure from the changing features. The change need to be sure that the rest will not be affected from the changes. For a change, usually the smallest section will be most affected. The expansion adds the required feature is also one of the pressure that the software is good, because if not good change control will render both the software crash. So the Changeability properties are essential to the interest and focus on it.
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