The confinement and isolation of the crew of a long duration manned space flight mission such as the planned International Space Station or proposed expeditions to the Moon or Mars cause the social environment and the crew capabilities and limitations to be extremely influential to mission success. The systems engineering process must be executed within the constraints imposed by the system environment (including the social, technical, economic, and political (STEP) factors) as well as those constraints imposed by the personnel who must design, operate, and maintain the system.
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