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In the design of the operational concept for the CEV there are numerous choices regarding the locus of command and control. Systems such as power, propulsion, GN&C, life support, C&DH, etc. can be monitored and controlled by the flight crew, by onboard autonomous systems, by ground crew, or by ground autonomous systems. The decision of how to distribute control must be based on a complex trade-off between development and validation costs, operations costs, and reliability/risks. Getting thesedoi:10.1063/1.1867241 fatcat:2lysblwzhvanbizhvoanph6yvm