UX Research Research method

Card Sorting

Card sorting shows how people group and label content.

Card sorting makes mental models and useful terms visible as participants group clearly worded content cards using their own logic. The results provide structure hypotheses for later information architecture.

Core question

Which content groups and terms fit the mental models of the relevant audience?

Prepare a sort Method guide

Start comparison

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Participants: Based on research question
Time: Per study

The phase bar moves from research question to sorting patterns and structure hypotheses.

Paper illustration showing three sorted card stacks and an open question about a possible group.

Frame
Bound the question
Decide which structure decision the sort should inform.
Cards
Prepare cards and format
Write clear cards and select a sorting format.
Sort
Run the sort
Let participants sort independently and explain their labels.
Synthesize
Analyze patterns and variation
Compare sorts and turn similarities and differences into structure hypotheses.

Compare groups and labels, revise the structure hypothesis, and evaluate the resulting navigation with tree testing.

A good fit when

Use card sorting when content needs reorganizing or when a structure should be compared with a target group’s language and expectations. Choose open, closed, or hybrid sorting for the question.

Ideal for

Navigation design
Content organization
Labeling

Not good for

Visual design critique
Behavior strategy

Outputs

Sorted content
Items, groups, and participant labels with traceability.
Structure hypotheses
Recurring clusters, disagreement, and open label questions.

Sort analysis

Fictional teaching example

Track content cards, groups, participant labels, and open structure questions.

Sort analysis
Sort finding	Content cards	Participant group	Participant label	Analysis question
Example groupRecord a group from one individual sort.	Search for a tool; check availability	P1: grouped together	Find a suitable tool	Does this grouping recur in other sorts?
VariationKeep a single card or alternative placement visible.	View pickup location	P1: separate group	Plan pickup	Is pickup its own task or part of reservation?

1. Content cards
Example group
Search for a tool; check availability
Variation
View pickup location
2. Participant group
Example group
P1: grouped together
Variation
P1: separate group
3. Participant label
Example group
Find a suitable tool
Variation
Plan pickup
4. Analysis question
Example group
Does this grouping recur in other sorts?
Variation
Is pickup its own task or part of reservation?

Keep group labels in the participant’s wording.

NN/G

First step

Name the content whose expected grouping or label remains unclear.

Open the method guide

Where to go next?

UX Research

First-click Testing

Checks whether the newly ordered structure is found quickly in the interface.

Paper illustration of a participant using a prototype while an observer takes notes beside a highlighted usability issue.

UX Research

Usability Testing

Tests the navigation derived from the sorts against real tasks.

Deep dive

Purpose

When content only makes sense internally and users can't find the structure again, card sorting exposes their mental order. Terms, groups, and naming are then aligned with the target group's expectations.

How it works

Participants group content by their own logic and name the resulting clusters. The analysis shows which terms naturally belong together, which labels cause confusion, and where internal structure doesn't match the target group's mental order.

In detail

Card sorting makes visible how people mentally organize information. Content, functions, or topics are prepared as individual cards. In an open sort, participants create their own groups and assign labels; in a closed sort, they place cards into predefined categories. The results are compared to derive stable clusters, ambiguous terms, and possible navigation structures.

Facilitation

Choose cards with clear, everyday language and keep the set small enough for careful sorting to stay possible. The interesting point comes where terms frequently move around or groups get named differently; those spots later carry the risk. Close with a few stable clusters, problematic terms, and hypotheses for navigation or taxonomy.

The method guide walks execution through 4 phases, timing, 4 pitfalls, and clear stop criteria.

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Sources and topics

Topics

Information architecture Navigation Structure

Sources

Card Sorting: Uncover Users’ Mental Models for Better Information Architecture - NN/Gnngroup.comParticipants group individually labeled content cards; open, closed, and hybrid sorts answer different structuring questions.Card Sorting: How to Make Sense of It - NN/Gnngroup.comAnalysis compares groups, labels, similarities, and differences; findings inform hypotheses rather than dictate a final taxonomy.

In playbooks

Validate Information ArchitectureMove from unclear navigation to tested structure, labels, and findability signals.

Artifact templates

Card Sorting: WorksheetPrepare content cards, sorting format, and analysis of individual sorts.

markdown

card-sorting-working-template.md

Prepare content cards, sorting format, and analysis of individual sorts.

Card Sorting: Worksheet

Question

To be confirmed

Desired outcome

To be confirmed

Scope

One focused sorting study Time: Multi-session research initiative; duration depends on sorting format, recruitment, and comparative analysis.

Complete this worksheet on paper or in your own document during the work.

Preparation for this scope

Method setup

Materials: Research question, one card per content item, neutral sorting instructions, and a capture grid. Use a piloted digital sorting tool for remote studies.
Roles: A research or moderation lead explains the format neutrally and records questions. Participants sort individually; a group discussion can obscure individual results.
Advance information: Record the content inventory, audience, sort question, intended use of findings, and known internal categories.
Overall time needed: About 20–45 minutes for an individual sort. Plan preparation, recruitment, and comparative analysis separately; remote studies may run over several days.
Setup: Shuffle cards and check readability. For moderated work, explain the rules without examples that imply the expected taxonomy.