The difference of economical performances between a Shanghai diesel powered and a CNG powered bus is investigated by using life cycle cost assessment method (prices in 2003).
利用生命周期成本评估方法对上海市柴油和CNG公交车的经济性能进行了评价（2003年价格）。
Theories of quality cost management are expounded. A calculating method to determine the optimum values of quality cost and the assessment of quality cost economic results are explored.
本文论述了质量成本管理理论，探讨了质量成本最佳值的求法和质量成本管理经济效益评价。
A method for software cost estimation and risk assessment is presented in this paper.
论文提出了一种用于软件成本估计以及风险评估的方法。
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