Code - Pixels - I.A.

Fitts’s Law

The time to acquire a target is a function of the distance to and size of the target.

Hick’s Law

The time it takes to make a decision increases with the number and complexity of choices.

Jakob’s Law

Users spend most of their time on other sites. This means that users prefer your site to work the same way as all the other sites they already know.

Law of Prägnanz

People will perceive and interpret ambiguous or complex images as the simplest form possible, because it is the interpretation that requires the least cognitive effort of us.

Law of Proximity

Objects that are near, or proximate to each other, tend to be grouped together.

Law of Similarity

The human eye tends to perceive similar elements in a design as a complete picture, shape, or group, even if those elements are separated.

Miller’s Law

The average person can only keep 7 (plus or minus 2) items in their working memory.

Occam’s Razor

Among competing hypotheses that predict equally well, the one with the fewest assumptions should be selected.

Pareto Principle

The Pareto principle states that, for many events, roughly 80% of the effects come from 20% of the causes.

Parkinson’s Law

Any task will inflate until all of the available time is spent.

Serial Position Effect

Users have a propensity to best remember the first and last items in a series.

Tesler’s Law

Tesler's Law, also known as The Law of Conservation of Complexity, states that for any system there is a certain amount of complexity which cannot be reduced.

Von Restorff Effect

The Von Restorff effect, also known as The Isolation Effect, predicts that when multiple similar objects are present, the one that differs from the rest is most likely to be remembered.

Zeigarnik Effect

People remember uncompleted or interrupted tasks better than completed tasks.

Laws of UX is a collection of the maxims and principles that designers can consider when building user interfaces.

It was created by Jon Yablonski, Design Lead at Vectorform, creator of the Web Field Manual, and contributor to Storytelling.design.