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The concept of a general purpose life support system testbed for use in space grew out of considerations arising from the recent consolidation of NASA's Advanced Life Support (ALS) Systems programs. Both the physical-chemical and the biological approaches to regenerative life support will require significant amounts of in-space testing in order to prepare for the final development of systems for human life support. Considerations of the technical requirements and rationales for in-space testing has led to the concept of a common testbed that will allow faster and less expensive long duration tests.