Jakob Nielsen, a PhD in human-computer interaction, published the "Ten Principles of Usability" on January 1, 1995. Since 1995, he has taught thousands of Web designers about Web usability through his Alertbox mailing list and useit.com, although some of his ideas can be controversial, at least in the eyes of Web designers, He is a top leader in Web usability.

Among his principles:

Principle 1: State visibility principle

Principle two: the principle of environmental relevance

Rule 3: Undo the redo rule

Principle 4: The principle of consistency

Principle five: error prevention principle

Principle six: the principle of accessibility

Rule 7: Be flexible and efficient

Principle 8: Easy to sweep principle

Principle 9: The fault tolerance principle

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