IA
Closed Card Sorting
A practical information architecture method for validating predefined categories and checking whether users place content where you expect.
How to use closed card sorting to validate information architecture, refine category labels, and test whether your structure aligns with user expectations.
Quick take
If you want to test whether your existing structure makes sense to users, use closed card sorting.
Related Services
What it is
Closed card sorting is a UX serviceUser ResearchUnderstand user behaviour, validate ideas, and make clearer product decisions with evidence you can act on.Open service method used to evaluate how well predefined categories and structures work for users.
Participants are given a set of items and a fixed set of categories. Their task is to place each item into the category they think it belongs in.
Unlike guideOpen Card SortingExploring how users naturally group and label information to inform information architecture and navigation.Open guide, where users create their own groups, closed card sorting tests an existing or proposed structure.
The goal is to validate serviceInformation ArchitectureImprove navigation, content structure, and findability so users can understand where things are and how to move through them.Open service, glossaryNavigationHow users move around a website or product.Open glossary term, and glossaryLabellingLabelling is the practice of naming content, categories, and interface elements in a way that is clear and meaningful to users. It directly affects how users understand and navigate a product.Open glossary term.
Closed card sorting is most useful when you already have a structure in mind and need to know whether it actually makes sense to users.
When to use it
Use this method when you already have a structure to test.
It is most useful when:
It is less useful when:
Closed card sorting is often used after open card sorting and before tree testing.
Key takeaway
Use closed card sorting when the main question is whether your current or proposed structure works, not what the structure should be from scratch.
How to run it
Set up properly.
Before you start, be clear on what categories users will sort into, what items will be included, and what success looks like.
Ensure categories are clearly defined and meaningful.
Run the method.
Closed card sorting is structured and evaluative.
Provide users with predefined categories. Give them a set of items to sort. Ask them to place each item into a category. Capture where items are placed. Optionally capture reasoning.
Keep instructions clear and unbiased.
Capture and make sense of it.
The value comes from measuring glossaryAlignmentAlignment is the shared understanding and agreement between teams, stakeholders, and objectives.Open glossary term.
Look across results to identify where users agree or disagree, items that are consistently misplaced, confusing or unclear categories, and glossaryPatternA reusable solution to a common design problem.Open glossary term in glossaryBehaviourBehaviour refers to how users interact with a system, including actions, patterns, and responses.Open glossary term.
Use this to refine structure and labels.
What to look for
Focus on:
Where it goes wrong
Most issues come from:
If categories are unclear, results will be too.
What you get from it
Done properly, this method gives you:
Key takeaway
It helps you ensure your structure works for real users.
Get in touch
If this sounds like something you need, we can help you validate and refine your structure so users can find what they need quickly.
No guesswork. No assumptions. Just structure that works.
FAQ
Common questions
A few practical answers to the questions that usually come up around this method.
What is closed card sorting in UX?
It is a method where users sort items into predefined categories.
When should you use closed card sorting?
Use it when validating an existing structure or glossaryNavigationHow users move around a website or product.Open glossary term.
How is it different from open card sorting?
guideOpen Card SortingExploring how users naturally group and label information to inform information architecture and navigation.Open guide explores user-defined structure, while closed card sorting tests a predefined one.
How many participants do you need?
Typically 15 to 30 to identify clear glossaryPatternA reusable solution to a common design problem.Open glossary term.
Does closed card sorting improve UX?
Yes. It helps ensure your structure aligns with user expectations.