User Experience
Cognitive Load Theory
Also known as: Mental load theory
Plain English
How much thinking something requires.
Definition
glossaryCognitive LoadCognitive load is the amount of mental effort required for a user to understand and interact with a product. High cognitive load makes tasks harder, slower, and more error-prone.Open glossary term Theory explains how the amount of mental effort required affects a user’s ability to glossaryProcessA process is a defined sequence of steps used to achieve a specific outcome.Open glossary term information.
In practice
Used to simplify glossaryInterfaceAn interface is the point of interaction between a user and a system, where inputs are made and outputs are received. It can be visual, physical, or conversational.Open glossary term, reduce complexity, and improve glossaryComprehensionComprehension is whether users actually understand the content, instructions, or interface in front of them. It is the outcome that matters, and it can fail even when the text is short, clear, and well presented.Open glossary term.
In context
Its practical use is in deciding what to remove. Every element on screen spends attention that the actual task then does not have.
The reality
Many products overload users with unnecessary information and decisions.
Compared with
Cognitive Load Theory vs Hick's Law
glossaryCognitive LoadCognitive load is the amount of mental effort required for a user to understand and interact with a product. High cognitive load makes tasks harder, slower, and more error-prone.Open glossary term theory covers total mental effort from all sources. glossaryHick’s LawHick’s Law states that the time it takes to make a decision increases with the number of choices available.Open glossary term addresses one specific source: the number of choices. Hick's Law is a narrow, testable case within the broader idea.
FAQ
Common questions
A few practical answers to the questions that usually come up around this term.
What is cognitive load theory?
It explains how mental effort affects understanding.
Why is cognitive load important?
Too much load makes glossarySystemA system is a collection of interconnected components that work together to achieve a specific function or outcome.Open glossary term hard to use.
How do you reduce cognitive load?
By simplifying design and reducing choices.
What causes high cognitive load?
Complexity and too much information.
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