敏捷方法考虑到迅速和紧密的增加或者阶段；减少开销；并且确保开发人员与客户之间的紧密联系。
Agile methodologies allow for fast and tight increments or phases; cut down overhead; and ensure a close relationship between developer and customer.
写功能设计规格是敏捷开发中非常核心的一部分，因为它可以让您迅速地迭代许多可能的设计，然后再编写代码。
Writing a functional specification is at the very heart of agile development, because it lets you iterate rapidly over many possible designs before you write code.
从ibm的观点来看，我想另一些原因在于商业利益并不是充分的，但是敏捷开发却迅速地在全球范围内被采纳。
A couple other reasons from an IBM point of view, I guess, is not that the business benefits aren't sufficient, but agile is quickly being adopted worldwide.
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