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The Oxygen Generation Subsystem (OGS), using the Hamilton Standard SPE®, has been successfully tested as a part of the Life Support System Integration Facility (LSSIF) phase II of the Early Human Testing (EHT) Initiative at NASA's Johnson Space Center (JSC). Analysis of the OGS test was conducted. Correlations for oxygen and hydrogen current efficiencies and cell stack voltage with respect to various operating parameters were developed using the LSSIF test data. Analyses of the performance of the two-phase flow air-cooled heat exchanger and the heat loss of the components of the subsystem have also been conducted. A stand-alone OGS model and a simulation model using the CASE/A (Computer Aided System Engineering and Analysis) computer simulation tool have been developed and verified successfully.