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Not Available Thin film inflatable concentrators, via ground testing, have shown to be a viable alternative to current systems. Joint efforts between SRS, AFRL, Thiokol, and NASA have demonstrated the effectiveness of these technologies throough deployment, photogrammatic shape measurement, and on-sun testing. For long term space power, propulsion, and communication applications, long concentrator lifetime is essential. Micrometeoroid penetration and UV degradation become important issues. In Phase I, tasks including incorporating an innovative leak sealing technology, and proving the feasibility of a flight demonstration involving the deployment and solar concentration of a 5 meter aperture inflatable concentrator are proposed. Phase II efforts will focus on the fabrication, integration and testing of a near term inflatable concentrator experiment.