requrirement

Requrirement is typically a misspelling of the word requirement. In general, a requirement is a condition or capability that must be met or possessed by a product, service, or system to satisfy a contract, standard, specification, or user need. Requirements can be functional, describing specific behaviors or functions, or non-functional, describing quality attributes such as performance, security, reliability, or usability. They may also be categorized as business requirements, stakeholder requirements, system requirements, or technical requirements.

The practice of defining and maintaining requirements is known as requirements engineering or requirements management. It encompasses activities such as elicitation, analysis, specification, validation, and change management. Typical deliverables include a requirements specification, user stories, use cases, and a requirements traceability matrix. Requirements are intended to be clear, verifiable, and traceable to their sources and to test cases or acceptance criteria.

Standards and guidelines influence good practice; for example, IEEE 29148-2011 formalizes requirements engineering processes, and systems engineering handbooks discuss requirements life cycles and verification. In software and systems engineering, well-written requirements support scope control, testing, and cross-team alignment.

Common issues include ambiguity, incompleteness, conflicting or changing requirements, and excessive detail. Good practices emphasize unambiguous language, measurable acceptance criteria, verifiability, and traceability from stakeholder needs through design, implementation, and testing.

Domains that rely on requirements include software development, product management, and systems engineering, where the quality of requirements directly affects project outcomes.