Recommendation. Systems analysis and computer modeling are essential tools for making system trade-offs and optimizing performance. The PNGV should create detailed, rigorous cost and design reliability models as soon as possible to support ongoing technology selection. These models should be continually upgraded as new information becomes available.

Recommendation. Because cost is a significant challenge to the PNGV, the USCAR partners should continue to conduct in-depth cost analyses and to use the results to guide new development initiatives on components and subsystems.