UX Laws

Become familiar with a collection of UX laws and principles, and learn how to implement them in your designs.

Hick's Law for UX design

Hick's Law

Hick’s Law states that the more options a user is presented with, the longer it will take them to make a decision.

Hick's Law

Fitts's Law for UX design

Fitts's Law

Fitts's Law states that the amount of time taken to move to and select a target is a function of the distance to and size of the target.

Fitts's Law

Tesler's Law for UX design

Tesler's Law

Also known as "The Law of Conservation of Complexity", Tesler's Law states that systems have an inherent amount of complexity that cannot be reduced.

Tesler's Law

Jakob's Law for UX design

Jakob's Law

Jakob's Law states that users spend more time on other websites so they expect your website to work in the same way, that they are already familiar with.

Jakob's Law

Von Restorff effect for UX design

Von Restorff Effect

Also known as "The Isolation Effect", the Von Restorff Effect states that users are more likely to remember an object if it is visually different from similar objects.

Von Restorff Effect

Miller's Law for UX design

Miller's Law

Miller's Law states that the average person can only keep 7 (plus or minus 2) items of information in their working memory at a time.

Miller's Law

Aesthetic-Usability Effect for UX design

Aesthetic-Usability Effect

Users often perceive visually-pleasing products as being easier to use.

Aesthetic-Usability Effect

Pareto Principle for UX design

Pareto Principle

The Pareto Principle (or the 80/20 rule) states that ~80% of effects come from ~20% of the causes.

Pareto Principle

Doherty Threshold for UX design

Doherty Threshold

If a computer responds to a users input in <400ms, the user will take less time to make their next decision.

Doherty Threshold