Specification Tree
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.
- Assembly¹ specifications - generated by subsystem responsible contractors
- Subsystem specifications - generated by system responsible prime contractor
- System (design to) specification - generated by system responsible prime contractor
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).
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Famous quotes containing the word tree:
“Every tree sends its fibres forth in search of the Wild. The cities import it at any price. Men plow and sail for it. From the forest and wilderness come the tonics and barks which brace mankind.”
—Henry David Thoreau (1817–1862)