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Non-functional requirements define a system's quality attributes such as performance, security, scalability, and maintainability. They complement functional requirements and influence architecture, design, and organizational decisions. Formulating measurable criteria enables verification, testing, and clear alignment with stakeholder expectations. They are c…
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Non-functional requirements describe system quality attributes and constraints such as performance, security, availability, usability, or maintainability.
They grew from the need to plan and test software quality beyond its functions. Quality models and systematic requirements engineering organised these expectations so they could be specified early and evaluated later.
A functional requirement says what a system does; a non-functional one adds the quality conditions. Make it measurable, for example response time under load or recovery time after failure.
It describes a property used to assess a system.
It limits technology, operation, or design independently of one feature.
Metrics and thresholds make a quality claim testable.
Non-functional requirements shape architecture, cost, and user trust. Clear targets help resolve trade-offs among security, speed, availability, and effort early.
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