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The extensive reliability engineering program performed during the development of the DDEC I and DDEC II systems is described. This program insured that established reliability goals would be met and objectively demonstrated before the DDEC systems were released to the marketplace. Reliability goals representing the most stringent customer expectations were established at the program start. Then a formal reliability growth test program was performed that included running on engine dynamometers, at selected domiciled truck locations and in a broad range of customer revenue service vehicles.