Mental model

A mental model is the picture a person carries in their head of how something works, shaped by their previous experiences, assumptions and expectations. When someone opens a new app, they expect it to behave like the products they already know.
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Good design aligns the interface (the “system model”) with the user’s mental model. When the two match, the product feels intuitive; when they clash, users get confused, make errors and often blame themselves.

Why does it matter?

Designing for existing mental models reduces the learning curve — people transfer what they already know instead of relearning from scratch. That is why a trash-can icon means delete and a magnifying glass means search almost everywhere.
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When you must break a mental model for a genuinely new interaction, you have to invest in clear signifiers, onboarding and feedback to help users build a new one.

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