How to verify that a non-functional requirement is measurable?

Question

In what ways can an analyst check that a formulated non-functional requirement is measurable and testable?

KSAM.IISAD · Accepted Answer

To ensure that a non-functional requirement is measurable, the analyst should check whether it contains clear quantitative or qualitative criteria—for example, specific values for response time, throughput, or availability level. A requirement is considered measurable if it can be verified using objective metrics or tests. The SMART principle (specific and measurable) is applied for this, as well as standard phrasing templates such as: "no more than X seconds," "availability not less than Y%", etc. If the requirement is formulated vaguely (for example, "fast," "convenient"), it needs to be specified.

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