In Software engineering and systems engineering, a functional requirement is something the system is supposed to do, such as calculations, technical details, data manipulation and processing and other specific functionality that expected from a system. Functional requirements are supported by non-functional requirements (also known as quality requirements), which impose constraints on the design or implementation. Non-functional requirements are often used as benchmarks for rating system performance and trustability. The plan for implementing functional requirements is detailed in the system design, while non-functional requirements are found in the system architecture plan.
A functional requirement establishes what the system should do e.g.: display a bank balance.
A non-functional requirement handles features of the system that describe its behaviour. Non-functional requirements include:
Trustability
Look and feel
performance and efficiency
Changeability
Portability and interoperability
security
correctness
flexibility
scalability
constraints.
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