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Summary of Famous UX Laws for Every UX/UI Designer

20 UX Laws

Introduction about UX Laws

This is a list of the basic 20 UX laws that every designer should know and apply when creating user interfaces:

– Aesthetic-Usability Effect: Users perceive aesthetic design as a design that’s more usable because. aesthetics apps and sites lead to more time using and exploring them.

– Doherty Threshold: Productivity increases when a site or app and its users interact at a pace that ensures that neither has to wait on the other.

– Fitts’s Law: The time to acquire a target is a depending on the distance to the target and the size of the target.

– Hick’s Law: The time it takes to make a decision increase when the number and complexity of choices increase.

– Jakob’s Law: Users prefer your site or app to work the same way as all the other sites or apps they already know or used before.

– Law of Common Region: Items tend to be perceived as groups if they are sharing an area with a clearly defined boundary.

– Law of Prägnanz: Users perceive and interpret ambiguous or complex images in the simplest form possible because the interpretation requires the least cognitive effort of them.

– Law of Proximity: Objects that are near, or proximate to each other, tend to be grouped in the user’s eyes.

– Law of Similarity: Users consider similar items in a design as a complete picture, shape, or group, even if those items are separated by white space.

– Law of Uniform Connectedness: Visually connected elements are perceived by the human eye as more related to the core of the app or site than elements with no connection.

– Miller’s Law: The average person can only keep 7 (plus or minus 2) items in their working memory for every task he/she does.

– Occam’s Razor: When competing hypotheses that predict equally well, choose the one with the fewest assumptions.

– Pareto Principle: 80% of the results come from 20% of the causes.

– Parkinson’s Law: Any task will inflate until all of the available time is spent.

– Peak-End Rule: People judge an experience mostly based on how they felt at its peak or its end, rather than the total average of every moment of the experience they have been through.

– Postel’s Law: Make sure to be liberal and open-minded in what you accept, and conservative in what you send.

– Serial Position Effect: Users will remember the first and last items in a series better than the in-between items.

– Tesler’s Law: Or the Law of Conservation of Complexity, states that for any system there is a certain amount of complexity that cannot be reduced.

– Von Restorff Effect: Or the Isolation Effect, says when multiple similar objects are shown, the one that differs from the rest the most will most likely be remembered by users of the site or app.

– Zeigarnik Effect: People always remember uncompleted operations or interrupted tasks better than completed tasks.

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