We can categorize quality using the FURPS+ model [GRA92 - Robert Grady 1992. Practical Software
Metrics for Project Management and Process Improvement. Prentice-Hall]:
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Functionality
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Usability
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Reliability
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Performance
-
Supportability
-
+ (and others)
This is the same categorization scheme that could be used for requirements.
For each of these dimensions, one or more individual types of tests should be implemented and executed during one or
more of the different levels of test.
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