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System requirements in spacecraft systems are the specific system requirements needed to design and operate a spacecraft or a spacecraft subsystem. == Overview == Spacecraft systems are normally developed under the responsibility of space agencies as NASA, ESA etc. In the space area standardized terms and processes have been introduced to allow for unambiguous communication between all partners and efficient usage of all documents. For instance the life cycle of space systems is divided in phases: * Phase A: Feasibility Study * Phase B: Requirements Definition * Phase C/D: Design / Manufacturing / Verification * Phase E: Operational usage. At the end of phase B the system requirements together with a statement of work are sent out requesting proposals from industry. 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 requirements (spacecraft system)」の詳細全文を読む スポンサード リンク
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