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Future long duration manned space missions will require regenerative Life support subsystems which operate efficiently and reliably with minimum attendance from the crew. An essential prerequisite to achieving this goal is the development of highly reliable controllers to control the various life support processes, to monitor subsystem performance, and to provide automatic shutdown of a process when out of tolerance conditions persist. While life support controller designs have improved dramatically over the years, it is now no Longer good enough to continue a philosophy where the only result of the fault monitoring process is to provide an automatic shutdown of the subsystem.