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.
它可以让演讲者迅速罗列出演讲要点，制作出显示图片与图表的幻灯片。
It quickly allows one to compose speaking notes and to create slides showing images and graphs.
它可以迅速更新表单数据，让人感觉应用程序是立即完成的，表单没有提交或刷新而用户得到了新数据。
It can update form fields on the fly, giving that immediate feeling to your application — users are getting new data without their form being submitted or refreshed.
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