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Specification tree
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<p>A specification tree shows all <a href="/facts/Specification_(technical_standard)/xEMUsktp">specifications</a> of a technical system under development in a hierarchical order. </p><p>For a <a href="/facts/Spacecraft_system/YQqQaUw0">spacecraft system</a> it has the following levels: </p> <ul><li>System (requirements) specification - generated by customer <ul><li>System (design to) specification - generated by system responsible prime contractor <ul><li>Subsystem specifications - generated by system responsible prime contractor <ul><li>Assembly specifications - generated by subsystem responsible contractors <ul><li>Unit specifications - generated by subsystem (or assembly) responsible contractors.</li></ul></li></ul></li></ul></li></ul></li></ul>