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A specification tree shows all specifications of a technical system under development in a hierarchical order. For a spacecraft system it has the following levels: * System (requirements) specification - generated by customer * * System (design to) specification - generated by system responsible prime contractor * * * Subsystem specifications - generated by system responsible prime contractor * * * * Assembly¹ specifications - generated by subsystem responsible contractors * * * * * Unit specifications - generated by subsystem (or assembly) responsible contractors. ¹ An assembly level is defined as intermediate level when the subsystem contractor prefers to contract a group of units with complex interfaces to another contractor (for instance the operating system and subsystem application software can be an assembly of the data management subsystem). == See also == * Specification (technical standard) 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「Specification tree」の詳細全文を読む スポンサード リンク
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