The interface should always tell the user what is going on, through timely and appropriate feedback.
Heuristic · Nielsen heuristics
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nielsen
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Use the words, concepts and order that your users already have, not the ones your database has.
Heuristic · Nielsen heuristics
Users make mistakes and change their minds, so every state needs a clearly marked way out.
Heuristic · Nielsen heuristics
The same thing should look and behave the same way everywhere, and follow platform convention where one exists.
Heuristic · Nielsen heuristics
Better than a good error message is a design in which the error cannot occur.
Heuristic · Nielsen heuristics
Recognising something on screen is far easier than remembering it, so keep the information visible.
Heuristic · Nielsen heuristics
Accelerators that experts use and novices ignore let one interface serve both populations.
Heuristic · Nielsen heuristics
Every extra element competes with the ones that matter, so content should earn its place on the screen.
Heuristic · Nielsen heuristics
Error messages should say what happened, why, and what to do next, in plain language.
Heuristic · Nielsen heuristics
Aim for a product that needs no explanation, then write help for the cases where that is impossible.
Heuristic · Nielsen heuristics