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Since the beginning of the U.S. space program, it has been postulated that as manned missions became longer and crew size increased, the penalties of storing or routinely resupplying consumables would at some point become prohibitively costly. This paper reports on a study that was conducted to determine what missions would benefit from Controlled Ecological Life Support System (CELSS) technology. The study focused on manned missions selected from NASA planning forecasts covering the next half century. Comparison of various life support scenarios for the selected missions and characteristics of projected transportation systems provided data for cost evaluations. This approach identified missions that could benefit from a CELSS, showed the magnitude of potential cost savings, and indicated which system or combination of systems would apply.

A summary of the Space Operations Center (SOC) crew skill and scheduling analysis is presented in this paper. The analysis was conducted by Boeing Aerospace Company on contract to NASA-Johnson Space Center. Brief descriptions of the SOC design, projected missions, and mission modeling are presented. The analytical approach is outlined as well as the resulting crew skill allocations and projected crew sizes through the year 2000.