A requirement describes a stakeholder need or a capability, property, or constraint that a solution must satisfy.
It may express a business goal, user need, system function, interface, quality target, or legal condition. Therefore, teams should classify each requirement according to its purpose.
Some statements describe desired outcomes without defining a solution. In contrast, others specify system behaviour, technical conditions, or design constraints. Clear separation helps teams avoid premature design decisions.
Teams may document needs through natural language, models, tables, or formal specifications. Moreover, each statement should remain clear, necessary, consistent, and verifiable.
Traceability connects documented needs with their sources, related statements, design elements, and test cases. Consequently, teams can analyse changes and verify implementation results.
Teams should also validate, prioritize, version, and manage these statements throughout the project. In addition, clear responsibilities and change rules support consistent management.
Well-defined needs improve communication, guide development, enable objective testing, and support stakeholder acceptance.
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