“Computational science and engineering in general and the mission of leadership computing, in particular, is very important for U.S. technology leadership. The impact is both very broad and deep. It is difficult to imagine that a country can have leadership in science and engineering, and, as a result, define the leading edge in innovative technologies without being truly excellent in computational science. This importance has been realized in many ways, from the Department of Energy’s national leadership in computational science and engineering, to the broad bi-partisan support for supercomputing in federal R&D budgets, to the growing utilization of supercomputing by industry. Titan, specifically, is a major step on the road to maintain expected growth rates in performance while “changing the game” with respect to energy efficiency for supercomputers based on commodity hardware components.”