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UX Laws

Laws of UX is a collection of the maxims and principles that designers can consider when building user interfaces, curated by Benjamin Libor

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VOTES
PRINCIPLE DESCRIPTION KEY TAKE AWAY LINK
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Postel’s Law Be liberal in what you accept, and conservative in what you send. Be empathetic, flexible, and tolerant to any number of actions the user could possibly take. This means accepting...More en.wikipedia.org
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Parkinson’s Law Any task will inflate until all of the available time is spent. Articulated by Cyril Northcote Parkinson as part of the first sentence of a humorous essay published in The Economist...More en.wikipedia.org
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Pareto Principle The Pareto principle states that, for many events, roughly 80% of the effects come from 20% of the causes. Focus the majority of effort on the areas that will bring the largest benefits to the most users. medium.com
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Occam’s Razor Among competing hypotheses that predict equally well, the one with the fewest assumptions should be selected. Analyze each element and remove as many as possible, without compromising the overall function. en.wikipedia.org
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Miller’s Law The average person can only keep 7 (plus or minus 2) items in their working memory. Chunking is an effective method of presenting groups of content in a manageable way. Organize content in groups of...More khanacademy.org
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Law of Uniform Connectedness Elements that are visually connected are perceived as more related than elements with no connection. Group functions of a similar nature so they are visually connected via colors, lines, frames, or other shapes. en.wikipedia.org
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Law of Similarity The human eye tends to perceive similar elements in a design as a complete picture, shape, or group, even if those...More Ensure that links and navigation systems are visually differentiated from normal text elements, and are consistently...More en.wikipedia.org
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Law of Proximity Objects that are near, or proximate to each other, tend to be grouped together. The law of proximity is useful by allowing users to group different clusters of content at a glance en.wikipedia.org
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Law of Prägnanz People will perceive and interpret ambiguous or complex images as the simplest form possible, because it is the...More The human eye likes to find simplicity and order in complex shapes because it prevents us from becoming overwhelmed...More smashingmagazine.com
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Law of Common Region Elements tend to be perceived into groups if they are sharing an area with a clearly defined boundary. Adding borders (creating common regions) around an element or group of elements is an easy way to create separation...More en.wikipedia.org
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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...More You can simplify the learning process for users by providing familiar design patterns. nngroup.com
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Hick’s Law The time it takes to make a decision increases with the number and complexity of choices. More choices results in longer to think about these choices and make a decision. Simplify choices for the user to...More interaction-design.org
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Fitts’s Law The time to acquire a target is a function of the distance to and size of the target. Make elements you wish to be easily selectable large and position them close to users. This law especially applies to...More interaction-design.org
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Tesler’s Law Also known as The Law of Conservation of Complexity, states that for any system there is a certain amount of...More While working for Xerox PARC in the mid-1980s, Larry Tesler realized that the way users interact with applications...More en.wikipedia.org
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Serial Position Effect Users have a propensity to best remember the first and last items in a series. Placing the least important items in the middle of lists can be helpful because these items tend to be stored less...More interaction-design.org
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Von Restorff Effect Also known as the isolation effect, the von Restorff effect predicts that when presented with multiple objects, we...More Make important information or key actions visually distinctive. en.wikipedia.org
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Zeigarnik Effect People remember uncompleted or interrupted tasks better than completed tasks Use progress bars for complex tasks to visually indicate when a task is incomplete, and thus increase the likelyhood...More en.wikipedia.org
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Aesthetic Usability Effect Users often perceive aesthetically pleasing design as design that’s more usable. Aesthetically pleasing design can make users more tolerant of minor usability issues. Aesthetically pleasing design...More nngroup.com
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Doherty Threshold Productivity soars when a computer and its users interact at a pace (
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CURATOR
Benjamin Libor

Creator behind Spreadshare, interested in design and content creation of all sorts. 

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