Research

Card Sorting

Card sorting shows how people *actually* think about information. Not how you *assume* they do. Give participants cards with content or features. Ask them to group related items. You'll see mental models you never expected. The real value isn't the final categories. It's watching someone struggle with a card, hearing them explain why 'Settings' could be in multiple places. You'll realize your navigation only makes sense to you.

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Duration
1 hour
Group Size
5-15
Category
Research
Difficulty
Easy

  • Learn how users naturally group information.

  • Find terminology that matches user expectations.

  • Spot confusing parts of your information architecture.

  • Build navigation based on real mental models.

  • Uncover disagreements about categories before launch.


  • Information architecture reflecting user mental models.

  • Validated category labels and navigation.

  • Insights into how different user groups think.

When choosing card content, ensure each card is at the same level of detail. Don't mix 'Account Settings' with 'Change Password.' Test navigation with menu labels. Test content with article titles.

Staying quiet is the hardest part. You'll want to explain. Don't. If they ask, shrug and say, 'Whatever you think it is.' Confusion is valuable.

Analyze agreement and disagreement. 12/15 putting 'Billing' with 'Account' is a clear signal. A three-way split is a problem. Create a similarity matrix showing grouping frequency. Tools like OptimalSort do this.

Open sorts (participants create categories) are best for early discovery. Closed sorts (you provide categories) are best for validating a structure. Open first, then closed.

Watch for 'Miscellaneous' piles. These cards need attention. Labels may be confusing, or items don't fit. Solve these problems.

For qualitative insights, 5-8 participants reveal patterns. For statistical confidence, aim for 15-30. More than 15 rarely adds much.

  1. Setup (5 minutes). Write one item per index card. Website: page names or features. App: menu items or tasks. Use 30-50 cards. Shuffle each deck. Give each participant the same shuffled deck.

  2. Open Card Sort (20-30 minutes). Say: 'Group these cards as you see fit. There's no right answer.' Let them work. Don't explain the cards. If they don't understand a label, that's useful data. Once grouped, have them name each category on a sticky note. Use their exact words.

  3. Closed Card Sort Alternative (15-20 minutes). If you have categories to test, create labeled bins. Give participants cards. Say: 'Sort these into the categories that make the most sense.' Watch where they hesitate. Note misplaced cards.

  4. Think-Aloud Protocol (during sorting). Ask participants to narrate. 'I'm putting this here because...' and 'I'm not sure if this belongs...' are invaluable. Record these explanations to understand their reasoning.

  5. Debrief Each Participant (5 minutes). After sorting, review their groups. Ask about cards that took a long time. Ask about single-item groups. Ask about near-misses. These edge cases are insightful.

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  • Review participant profiles and expectations
  • Prepare all materials and supplies
  • Test technology and room setup

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  • Complete pre-session survey
  • Review background materials
  • Prepare examples or case studies

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  • Index cards or sticky notes (30-50 per set)

  • Markers

  • Large table or wall space

  • Camera or phone

  • Spreadsheet

  • Remote option: digital card sorting tool (OptimalSort, Maze, or Miro)

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Card Sorting Analysis Spreadsheet
An Excel spreadsheet template to help analyze the results from a card sorting exercise. [26]

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