Discussion
Which problem exists from the management perspective in the incremental model ?
Answer: D
The problem is that system structure tends to degrade as new increments are added and regular changes corrupt its structure.
Sommerville lists this as a drawback of incremental development: unless time and money are spent on refactoring, regular change corrupts the structure, and adding further changes becomes increasingly difficult and costly. The process is also less visible to managers.
Options A and B claim the structure improves or becomes robust, the opposite of the problem. Option C pairs degradation with better performance, which is not the point.
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