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 specification - generated by customer
- * System 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 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.
