IA
Card Sorting
An information architecture method for learning how people group content and what they call it, in open, closed and hybrid forms.
How to use card sorting to understand user mental models and shape information architecture, and how to choose between the open, closed and hybrid variants.
What it is
Card sorting is a serviceUser ResearchUnderstand user behaviour, validate ideas, and make clearer product decisions with evidence you can act on.Open service method for finding out how users would organise your content, and what language they would use to describe it.
Participants are given a set of items, usually pieces of content or glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term, and asked to group them. Depending on the glossaryVariantA variant is a version of a design or experience used in testing or experimentation.Open glossary term, they either invent the categories themselves or work with ones you supply.
The output is not an serviceInformation ArchitectureImprove navigation, content structure, and findability so users can understand where things are and how to move through them.Open service. It is evidence about how people expect one to work, which is the input to designing it.
Card sorting tells you how users think content should be grouped. It does not tell you whether they can find anything once you have grouped it.
Open, closed or hybrid: which one you need
The three glossaryVariantA variant is a version of a design or experience used in testing or experimentation.Open glossary term answer different questions, and the one you want depends on whether you already have a structure.
Key takeaway
Open discovers a structure, closed tests one, and hybrid does both at the cost of a messier result.
When to use it
Card sorting earns its place when the question is about grouping and naming.
It is most useful when:
Card sorting and tree testing answer opposite halves of the same question, and most information architecture work needs both.
How to run it
The mechanics are simple. Almost all of the quality comes from the preparation.
Set up properly
Decide which items are in scope, how many participants you need, and which glossaryVariantA variant is a version of a design or experience used in testing or experimentation.Open glossary term answers your question.
- Around 30 to 60 items. Past that, people stop sorting and start filing.
- Around 15 to 30 participants, which is where grouping glossaryPatternA pattern is a reusable solution to a design problem that recurs across products and contexts. It captures an approach already shown to work, so a team solves the problem once rather than every time it appears.Open glossary term become legible.
- Item names in user language, not glossarySystemA system is a collection of interconnected components that work together to achieve a specific function or outcome.Open glossary term language. Otherwise you are testing 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, not grouping.
Run the method
Give participants the items and ask them to group them in a way that makes sense to them. In a closed or hybrid sort, supply your categories at this point.
Ask them to label each group in their own words, and to talk through their reasoning as they go. The reasoning is usually worth more than the grouping.
Encourage people to sort naturally rather than logically. You want the intuition, not a considered glossaryTaxonomyTaxonomy is the system used to classify and organise content into structured categories. It defines how content is grouped, named, and related within a product or system.Open glossary term.
Capture and make sense of it
Look across participants rather than at any one of them. The value is in the glossaryPatternA pattern is a reusable solution to a design problem that recurs across products and contexts. It captures an approach already shown to work, so a team solves the problem once rather than every time it appears.Open glossary term.
- Items that were grouped together consistently
- The words people reached for when naming a group
- Items that landed somewhere different every time
- Differences between participants that suggest more than one audience
Where it goes wrong
Most of the damage is done before anyone sorts anything.
What you get from it
Done properly, this method gives you:
Key takeaway
It helps you structure content the way users expect.
Get in touch
If this sounds like something you need, we can help you structure your content in a way that makes sense to your users.
No guesswork. No assumptions. Just clarity you can build on.
FAQ
Common questions
A few practical answers to the questions that usually come up around this method.
What is card sorting in UX?
It is a research method where users group content into categories, so you can see how they expect it to be organised and what they call it.
What is the difference between open, closed and hybrid card sorting?
In an open sort users create their own categories and labels. In a closed sort you supply the categories and they place items into them. A hybrid sort supplies categories but lets users add their own.
How many items and participants do you need?
Typically 30 to 60 items and 15 to 30 participants. More items than that and people start filing rather than sorting.
Is card sorting the same as tree testing?
No, and they answer opposite questions. Card sorting tells you how people would group content. Tree testing tells you whether they can find it once it has been grouped. Most information architecture work needs both.
Does card sorting improve UX?
It does when the problem is structural. It ensures navigation and grouping match how users think, rather than how the organisation is arranged.
Quick take
If you want to know how users group and name your content, run a card sort. Which of the three variants you run depends on whether you have a structure yet.
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