Regenerable life support technologies are being developed for use in the advanced extravehicular mobility unit (AEMU) aboard Space Station Freedom. NASA/JSC has made steady progress in the supporting technology areas but there are still design options that must be evaluated before the final selections are made for the flight hardware. A “preprototype” hardware program has been initiated to further define options. Lockheed Engineering and Sciences Co. has been asked to support this program by designing, procuring, integrating and testing this hardware. This paper describes the actions to date and those planned for the next three years to perform this interim technology readiness demonstration.