正净现值标准—这个标准要求收益限制比任何已经投产的项目成本的现值大。

Positive net present value criterion — This criterion requires the present value of benefit to be larger than the present value of costs for any project that is to be undertaken.

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最大净现值标准——资源应该分配成具有利用最大价值，如果从所有可能利用的资源中收获净效益。

Maximum net present value criterion — Resources should be allocated to those USES which maximize the value if the net benefits received from all possible USES of those resource.

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然后得出基本情况，最好情况，最差情况下的净现值，再计算平均净现值和标准偏差，（粗略地）估计该项目的内部固有风险的大小。

Then obtain base-case, best-case, and worst-case NPV and calculate mean NPV and standard deviation to (roughly) estimate the magnitude of the risk inherent to the project.

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