设计用户界面时，你可以从许多流程中选择一种来执行，或者可能你已经有了一种流程。
You can follow one of any number of processes in designing the user interface. You might already have one.
也许你已经有了一个设计流程，不过我还是建议你考虑“敏捷法”。
You might already have one. However, I would suggest that you consider the Agile approach.
产品设计一书《设计草图》，介绍了产品设计整个草图绘画流程，有教程、讲解和案例。
The product design book Design Sketching explains the entire process of sketching for product design. It offers tutorials, explanations, and examples.
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