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The importance of non-functional and operational requirements (10 Aug 2004)
The quality of an application depends on more than how well it satisfies user-functional requirements. Even an application that successfully makes it through development and deployment can encounter grumblings from users and system operators if it is hard to use, keeps failing, is difficult to diagnose, or consumes excessive resources. In addition to user-functional requirements, you must also consider how well the application satisfies the non-functional requirements and fits into the organization's operational environment.
Article URL: http://www-106.ibm.com/developerworks/web/library/wa-qualbust1/

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