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Also sometimes known as para-functional, this tag covers both the quality attributes beyond the functional, and the test techniques intended to reveal information about them. For example, performance, reliability, usability.
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Requirements confusion - Functional suitability as Non-functional characteristic (ISO25010)
At first let's look at the definition of functional requirement term from ISO/IEC 27000:2014 standard:
functional requirement
requirement that specifies a function that a system or system compon …