What are enduring and volatile requirements?

Enlist enduring and volatile requirements.
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–Enduring requirements. Stable requirements derived from the core activity of the customer organisation. E.g. a hospital will always have doctors, nurses, etc. May be derived from domain models–Volatile requirements. Requirements which change during development or when the system is in use. In a hospital, requirements derived from health-care policy. Source:http://en.docsity.com/en-docs/Requirements_Engineering_Process-Softwarre_Engineering-Lecture_Slides_
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Harker and others (Harker et alii., 1993) encouraged of which volatile specifications fall into several instructional classes.
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