Cognitive Load
The mental effort required to use an interface.
Cognitive load is the amount of thinking a user has to do to understand and operate an interface. Every extra choice, unclear label, or inconsistent pattern adds load; too much of it causes errors and abandonment.
Good design reduces cognitive load through clear hierarchy, sensible defaults, progressive disclosure, and familiar patterns — letting users focus on their goal, not the interface.
Key characteristics
- The mental effort a task demands; working memory holds only a few items at once.
- Three types: intrinsic (task difficulty), extraneous (poor design), germane (useful learning).
- Reduced by chunking, progressive disclosure, sensible defaults and clear hierarchy.
- High extraneous load causes errors, abandonment and frustration.
Example
Splitting a 20-field form into three short steps with a progress bar lowers perceived effort and lifts completion, even though the number of fields is unchanged.
Frequently asked questions
How do you reduce cognitive load in an interface?
Show only what's needed now (progressive disclosure), group related items, use familiar patterns, provide good defaults, write plainly, and prefer recognition (menus) over recall (remembering commands).
What is Hick's Law?
Hick's Law states that the time to make a decision grows with the number and complexity of choices. It's a practical reason to limit options and simplify navigation.
Related terms
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