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The process of studying user needs to arrive at a definition of system, hardware, or software requirements. [ ISO/IEC/IEEE 24765 ]
Requirements Analysis [ ISO/IEC/IEEE 24765 ]: The process of studying and refining system, hardware, or software requirements.
Requirements Analysis [ ISO/IEC 2382 ]: A systematic investigation of user requirements to arrive at a definition of a system.
Requirements Analysis [ ISO/IEC/IEEE 24765 ]: Determination of product- or service-specific performance and functional characteristics based on analyses of customer needs, expectations, and constraints; operational concept; projected utilization environments for people, products, services, and processes; and measures of effectiveness