What is card sorting?
Card sorting is a research method for learning how people group and label information. Each participant sees a set of items, then places related items together.
The patterns help you design menus, settings, categories, documentation, or any structure that has to feel obvious to someone who did not build it.
Use card sorting while the structure is still negotiable. Once you have a proposed navigation and need to know whether people can find things in it, follow with a tree test.
Open or closed card sorting?
The choice comes down to one question: are you discovering a structure, or testing one you already have?
Open card sort
You supply the cards. Respondents create the groups and name them in their own words.
Use it when:
You are still discovering how people see the domain.
What it gives you:
Natural groupings and the language people reach for.
Closed card sort
You supply the cards and the categories. Respondents decide where each card belongs.
Use it when:
You already have category names, a taxonomy, or a candidate navigation.
What it gives you:
Evidence about which items fit cleanly and which ones split opinion.
If the labels themselves are still uncertain, start open. If the structure exists and needs a reality check, go closed.
When card sorting earns its keep
Card sorting is useful when the team is debating where something belongs and everyone has a plausible answer.
- Planning a new navigation or settings area
- Reorganising a content library, product catalogue, or help centre
- Naming categories in words your audience recognises
- Checking whether features match the groups inside your product
- Comparing your current structure with the way users think about the same domain
It does not tell you whether people can complete a task in the finished interface. It gives you a candidate structure. Test that structure with a tree test before turning it into navigation.
Plan a card sort people can actually sort
1. Start with the decision
Name the structure you need to change. “Rework account settings” is useful. “Learn what users think” is still fog.
2. Choose open or closed
Use an open sort to discover groups and labels. Use a closed sort to test categories you already have.
3. Put one idea on each card
Use a short noun or noun phrase. Split compound ideas. If a card could mean two things, the result will measure the ambiguity instead of the structure.
4. Keep category clues off the cards
A label should describe the item, not whisper where you want it placed.
5. Ask what was difficult
A short follow-up question catches the items people could not place cleanly and the labels that made them hesitate.
6. Pilot before you launch
Watch for duplicate, vague, or overly broad cards. Keep the set focused enough that people can sort thoughtfully rather than race to the end.
Run a card sort in Fiuto
Start from the Card sort study template or add card sorting to a wider study. Fiuto handles open and closed sorts without making respondents learn research terminology first.
1. Set the task
Give respondents a concrete situation and tell them what the cards represent.
2. Add the cards
Enter the content, settings, features, or products you want people to group.
3. Choose the sort
Leave categories empty for an open sort. Add your categories for a closed sort.
4. Add context and a follow-up
Place an instruction before the task, then ask what felt difficult or unclear after it.
5. Launch and share
Send the study link to real users and collect their groupings in one results view.
Card sorting needs no upgrade: it runs on the free plan the same as Core or Pro.
Read agreement, not just answers
Fiuto’s card-sort results show the most common category for each card, the percentage of respondents who chose it, and the other categories people used.
A clear home
When one category draws most of the responses, the card has an expected place.
A split decision
When responses divide across categories, the item or the labels may be doing too many jobs.
The words people use
In an open sort, respondent-created group names give you language to consider for navigation and headings.
Treat the result as a candidate information architecture, not the final menu. A tree test checks whether people can find things inside the structure you choose.
Card sort or tree test?
They answer different questions and work best in sequence.
Card sort
How would people group and label these items?
Tree test
Can people find an item in this proposed structure?
Card sort input
A set of loose cards, with optional categories
Tree test input
A navigation tree and a task
Card sort outcome
A candidate structure and useful label ideas
Tree test outcome
Evidence about whether that structure is findable
Start with a card sort to shape the structure. Follow with a tree test to check it.
Keep exploring research methods
Frequently asked questions
01What is card sorting?
Card sorting is a research method that asks people to group a set of items in ways that make sense to them. It helps teams design information architecture, navigation, categories, and labels around how users think.
02What is the difference between open and closed card sorting?
In an open card sort, respondents create and name their own groups. In a closed card sort, you provide the categories and respondents place each card into one of them. Open sorts help discover a structure. Closed sorts help test one.
03When should I use a card sort instead of a tree test?
Use a card sort when you are still deciding how items should be grouped and labelled. Use a tree test when you already have a proposed navigation and want to know whether people can find specific things in it.
04How many cards should I include in a card sort?
Use enough cards to represent the structure you need to decide, but keep the set focused enough that people can sort thoughtfully. Pilot the study first, remove ambiguous or duplicate cards, and split an oversized domain into separate studies.
05Can Fiuto run open and closed card sorts?
Yes. Leave categories empty for an open sort, or add categories for a closed sort.
06What do card-sort results show in Fiuto?
For each card, Fiuto shows the most common category, the percentage of respondents who chose it, and the other categories people used.
07Do I need a finished design to run a card sort?
No. Card sorting works with labels, so it is useful before you design the navigation or hierarchy. If you already have a structure and want to test findability, use a tree test.
