如果客户习惯于以固定价格的模型购买开发工作，或者具有正式的指导原则，则采用敏捷开发流程对客户来说是非常大——甚至不可能——的更改。
If the customer is used to buying development with a fixed price model, or has formal guidelines, it can be quite a big-or even impossible-change for the customer.
这的确非常有效，以致我们能够创建一个固定时间、固定价格的业务模型。
It actually works so well that we have been able to create a fixed time, fixed price business model.
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