Specification tree

Updated on Dec 12, 2024

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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).

References

Specification tree Wikipedia

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