It is not evident how WBS 10.0 which is not just integration of all systems together but also the integration with launch vehicle as well as other related launch operations is calculated without knowing the complexities of the mission.  Also, environmental I&T associated with observatory integration is in WBS 10.0.

WBS 10 covers all S/C and System-level I&T that is not specific to an individual instrument or S/C subsystem. It includes Assembly & Integration, System Test, and Ground Support Equipment. Costs for the prototype/EM hardware used in flight system testbeds are covered within each applicable component estimate (represented by the Prototypes/EM TPSM input).

To watch the "Best Practices using the TruePlanning Space Missions" Webinar, click here.