The Joint Strike Fighter Integrated Subsystems Technology (J/IST) Demonstration Program will demonstrate the integration of secondary power & cooling functions and the replacement of central hydraulics with electrical power to achieve significant Life Cycle Cost (LCC) savings and warfighting benefits. LCC savings of 3 - 4 percent are projected for J/IST technologies versus 1995 state-of-the-art conventional subsystems. J/IST is being accomplished by a team of Boeing, Lockheed Martin, and McDonnell Douglas, under three separate but interrelated contracts. The major technologies are the Thermal/Energy Management Module (T/EMM), T/EMM integration with the engine, 270VDC power management and distribution, and electric primary flight control actuation. Affordability and warfighting benefits assessments are ongoing and will be updated based on the results of the final J/IST demonstrations.