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The Space Station requirements are divided into eleven systems. One of these systems, the Environmental Control/Life Support System (ECLSS) is further divided into seven functional categories as follows: Atmosphere Revitalization System, Atmosphere Pressure and Composition Control System, Module Temperature and Humidity Control System, Water Management System, Waste Management System, EVA Support and Safe Haven. The paper reviews the requirements for ECLSS in terms of the initial and growth operational capabilities of the Reference Space Station architecture. The paper reviews some of the results of a systems engineering study under way. Both regenerative and nonregenerative ECLSS techniques are reviewed. A design for all of the primary and backup technologies was established so that accurate trade studies could be performed. Each technology design started at a common interface condition for competing technologies.