The three rules in the real options model are: options have value; options expire; and Never commit early unless you know why.

这三个真实期权模型中的规则是：期权有价值；期权会失效；除非你知道原因，不要过早承诺。

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Then an appraisal model for relative value is set up to reduce the computation involved, thus enabling the real options thinking to be combined into the appraisal easily.

在此基础上构造了该法的相对值评价模型，减少了计算量，从而可以方便地把实物期权机制融入到评价中去。

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It makes a review of applying theory, research of model and methods of parameters estimation in real options method.

然后对实物期权的基本原理、模型、参数确定方法进行回顾。

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