The trio cover a wide range of design principles including how to encourage users to do something; guide them as to how to do it properly; and how to reduce errors by limiting choices and so on. There are even ways to subtly or not-so_subtly discourage users from doing what you don’t want them to do.

You may think as some of these principles as obvious and common-sensical, but the hallmark of a great product is exactly that it can be used by people armed only with common sense.

Take, for instance, the way to influence user’s behavior through the use of segmentation, spacing, and orientation:

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