1. The quality of being suited to serve a purpose well; practicality.
2. The key difference between functional and non functional requirements is that the functional requirements describe what the system should do while the non-functional requirements describe how the system works.
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Answer:
1. The quality of being suited to serve a purpose well; practicality.
2. The key difference between functional and non functional requirements is that the functional requirements describe what the system should do while the non-functional requirements describe how the system works.