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Excellent computer simulations are done for a purpose. The most valid purposes are to explore uncharted territory, to resolve a well-posed scientific or technical question, or to make a good design choice. Stand-alone modeling can serve the first purpose; the other two goals need a full integration of the modeling effort into a scientific or engineering program. Some excellent work, much of it related to the US Department of Energy's laboratories, is reviewed. Some less happy stories are recounted.