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The system lifecycle in systems engineering is a view of a system or proposed system that addresses all phases of its existence to include system conception, design and development, production and/or construction, distribution, operation, maintenance and support, retirement, phase-out and disposal. ==Conceptual design== The conceptual design stage is the stage where an identified need is examined, requirements for potential solutions are defined, potential solutions are evaluated and a system specification is developed. The system specification represents the technical requirements that will provide overall guidance for system design. Because this document determines all future development, the stage cannot be completed until a conceptual design review has determined that the system specification properly addresses the motivating need. Key steps within the conceptual design stage include: *Need identification *Feasibility analysis *System requirements analysis *System specification *Conceptual design review 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「system lifecycle」の詳細全文を読む スポンサード リンク
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