===== Non-Functional Requirements =====
[[ddsf:public:guidebook:06_append:glossary:start| Return to Glossary ]]

**Non-Functional Requirements** specify how the system should do it. Non-functional requirements do not affect the basic functionality of the system (hence the name, non-functional requirements). Even if the non-functional requirements are not met, the system will still perform its basic purpose.

If a system will still perform without meeting the non-functional requirements, why are they important? The answer is usability. Non-functional requirements define system behavior, features, and general characteristics that affect the user experience. How well non-functional requirements are defined and executed determines how easy the system is to use, and is used to judge system [[ddsf:public:guidebook:06_append:glossary:p:performance|performance]]. Non-functional requirements are product properties and focus on user expectations.

See also [[ddsf:public:guidebook:06_append:glossary:f:funcreq]].

Source: [[https://qracorp.com/functional-vs-non-functional-requirements/ | Non-Functional Requirements ]]