UX/UI Laws

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21 Terms

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Hick’s Law
The time it takes to decide increases with the number of options.
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Jakob’s Law
The tendency for users to develop an expectation of design conventions based on their cumulative experience from other websites
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Miller’s Law
The immediate memory span of people is limited to approximately seven items, plus or minus two
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Peak-End Rule
People will judge an experience by its peak and endpoint.
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Postel’s Law/Robustness Principle
Be flexible in what you accept from your users and limit what you ask of them.
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Tesler’s Law/Law of Conservation of Complexity
There’s a certain amount of complication that’s intrinsic to every system
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Zeigarnik Effect
Users remember interrupted tasks better than completed tasks
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Pareto Principle/80-20 Rule
80% of results come from 20% of the work
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Parkinson’s Law
A task will inflate to take up available time
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Aesthetic-Usability Effect
Users perceive visually pleasing sites as more usable
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Doherty Threshold
Human-computer interaction is best when the pace is less than 400ms so neither party has to wait for the other’s response
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Fitt’s Law
A target actions must be accessible to the user in both distance needed to travel and the target’s size.
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Goal-gradient Effect
The closer a user is to a goal, the faster they complete it
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Law of Common Region
Users group together elements that share an area with a defined boundary.
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Law of Proximity
Users group together elements that are close to each other
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Law of Uniform Connectedness
Visually connected elements are perceived as more related than elements with no connection
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Law of Prägnanz
People interpret complex or ambiguous images in simple forms because interpretation takes cognitive effort.
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Law of Similarity
Users perceive similar elements in a design as a whole, even if the elements are separated (ex. Google shows an already-visited link as purple instead of blue.)
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Occam’s Razor
Pick the simplest design (ex. Apple).
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Serial Position Effect
People best remember the first and last items in a given sequence
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Von Restorff Effect/Isolation Effect
People are more likely to remember an object that’s slightly different