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一个很好的例子阐释什么是实际可操作的设计原则。设计原则的阐述，不仅仅需要指明设计的方向，最好还要列清楚具体的、并且可执行的判断和操作细则。
A principle should offer practical guidance on how to solve a design problem within the context of a specific product. Compare these two versions of one of FutureLearn’s principles:
“Make it simple. Make it so simple it’s almost invisible! We should always work to remove friction on the platform, creating an experience that allows users real freedom to the content. If our platform is easy to understand, people can and will use it more.”
This statement makes perfect sense — no one can argue with the need to have a simple and usable interface. However, it’s not clear from this advice exactly what simplicity means and how to achieve it. Compare it with this version:
“No needless parts. Every design element, from the largest to the smallest, must have a purpose, and contribute to the purpose of a larger element it is part of. If you can’t explain what an element is for, most likely it shouldn’t be there.”
In practice, the question “Is it simple?” is much harder to answer objectively than “Does this contain needless parts?” The latter can be acted on by going through the interface and questioning the purpose of every element.
“In practice, the question “Is it simple?” is much harder to answer objectively than “Does this contain needless parts?” The latter can be acted on by going through the interface and questioning the purpose of every element.”