The long-term vision of the hydrogen economy will take several decades to achieve. Initially, government will play a key role in conducting the R&D to achieve the "technology readiness" needed to allow industry to make decisions on commercialization in the 2015 timeframe. The DOE Hydrogen Program has identified the key milestones for technology development, improvement, or demonstration. The Hydrogen Posture Plan provides details about these milestones. As technologies evolve and economic and systems analyses progress, these targets will be refined.