作为向迭代开发转换的第一步，在需求和设计阶段考虑一个或者更多的功能原型。
As a first step toward iterative development, consider one or more functional prototypes during the requirements and design phases.
另外一些开发人员则首先主要考虑用户界面，让功能仅仅成为界面设计选择的结果。
Others concentrate first on the user interface, letting functionality be only a consequence of the interface design choices.
设计应用程序利用这些功能时，考虑两件事情：智能手机的内存以及小屏幕设计。
When you design an application to take advantage of these features, consider two things: memory on your smartphone and designing for a small screen.
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