Errors should be made visible and easy to correct from "summary" of The Design of Everyday Things by Donald A. Norman
When something goes wrong, it should be immediately obvious what the problem is. Errors should be visible and easy to correct. This concept may seem straightforward, but it is surprising how often it is violated in the design of everyday objects. Take, for example, the case of a door that one must push to open. If the door has a handle that implies pulling, people will inevitably push when they should be pulling. This is a simple error, but it can cause frustration and embarrassment. The solution is to design the door with a handle that makes it clear which way the door opens. By making the error visible, people can quickly correct themselves and avoid any unnecessary confusion. Similarly, in the world of technology, error messages often fail to provide users with the information they need to correct their mistakes. Consider the typical computer error message that simp...
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