In the process of designing a website, one of the most critical—and sometimes most overlooked—aspects is the organization of information. How content is structured, categorized, and labeled directly impacts how users interact with a site, whether they find it intuitive, and ultimately, whether it meets their needs. This is where techniques like card sorting become incredibly valuable.
Card sorting is a simple, user-centered method used by UX designers to help inform a site’s information architecture (IA). Whether you’re creating a new site from scratch or redesigning an existing one, knowing when and how to use card sorting can lead to a more intuitive, user-friendly experience.
What Is Card Sorting?
Card sorting is a usability technique where participants are asked to group and categorize a set of labeled cards that represent content or features of a website. Each card typically lists a piece of content, functionality, or concept. The participant’s task is to organize these cards into groups that make sense to them, and sometimes to label these groups themselves.
Card sorting comes in two primary forms:
Open card sorting: Participants group cards in ways that make sense to them and create their own category names.
Closed card sorting: Participants sort cards into predefined categories provided by the design team.
Both methods generate insights about how real users expect content to be organized, helping the team shape navigation structures and labeling systems that match user mental models.
When to Use Card Sorting in the Web Design Process
Card sorting isn’t a one-size-fits-all technique. It’s most effective at certain points in the design process:
1. During the Discovery Phase of a New Website
When designing a brand-new website, the team often starts with raw content—sometimes dozens or hundreds of pages, documents, product listings, or service offerings. Card sorting helps uncover how users naturally think about this content. Running an open card sort early can reveal intuitive groupings that the team might not have considered.
2. When Redesigning an Existing Website with Complex Navigation
Many redesign projects start with an existing IA that has grown disorganized over time. In these cases, card sorting can help validate which parts of the existing structure still make sense and which areas need to be rethought. It can also uncover inconsistencies or confusing labels that users struggle with.
3. Before Creating a Sitemap or Wireframes
Card sorting is a foundational step before moving into sitemap creation or wireframe design. It gives structure to the site before the team commits to navigation menus or page layouts. Skipping this step can result in costly revisions later if the IA proves to be misaligned with user expectations.
4. When Working with Diverse Audiences
For websites that serve varied audiences (e.g., consumer and business users, different professional roles, or multiple regions), different user groups may have different mental models. Running multiple card sorts with different audience segments can help the team design flexible navigation systems that serve diverse needs.
How to Conduct a Card Sorting Session
Running a card sort is relatively straightforward, but it does require thoughtful preparation. Here’s a step-by-step guide:
Step 1: Define the Goals
What do you want to learn? Common goals include:
- Discovering how users group content
- Validating existing categories
- Understanding language preferences for navigation labels
Step 2: Select the Content to Include
Curate a list of cards to represent the most important pieces of content or functionality. Too many cards (more than 50) can overwhelm participants; too few won’t yield enough insight. Aim for 30–50 well-chosen cards.
Step 3: Choose the Right Participants
Recruit a representative sample of the website’s target audience. For internal sites or B2B products, this might include employees or clients. For public-facing sites, you may want to recruit external users.
Step 4: Decide on Open or Closed Sorting
- Use open sorting when you want to learn how users would naturally categorize content without predefined constraints.
- Use closed sorting when you want to validate or refine an existing set of categories.
Step 5: Run the Sort
You can conduct card sorting sessions in person with physical cards, but most teams today use online tools like OptimalSort or UXtweak to make the process more scalable and to facilitate remote participation.
Encourage participants to think aloud as they sort, explaining their reasoning—this qualitative insight is often as valuable as the final groupings.
Step 6: Analyze the Results
After collecting the data, analyze patterns:
- Which cards were frequently grouped together?
- Which categories emerged consistently?
- Which cards caused confusion or disagreement?
Cluster analysis tools can help visualize these patterns. The results can then inform the site’s IA and navigation structures.
Common Mistakes to Avoid
Card sorting is simple but can be misused if not carefully planned. Here are a few pitfalls to watch out for:
- Not defining clear goals: Without knowing what you want to learn, it’s easy to generate data that doesn’t help inform design decisions.
- Using too many or too few cards: Balance is key to getting actionable results.
- Ignoring the results: If your card sorting insights contradict your assumptions, it can be tempting to disregard them—but doing so undermines the purpose of the exercise.
- Relying on card sorting alone: Card sorting is just one input to IA design. It should be combined with other research methods like user interviews, task analysis, and usability testing.
Why Card Sorting Works
At its core, card sorting brings the user’s voice into the design of your website’s structure. It taps into mental models—the way users expect to find and interact with content—rather than imposing an internal or organizational perspective.
When navigation reflects these mental models:
- Users find content more easily.
- The site feels intuitive.
- Cognitive load is reduced.
- Engagement and conversions improve.
In other words, card sorting supports the broader goal of user-centered design by shaping one of the most fundamental aspects of the user experience: how content is organized and accessed.
Conclusion
In any website project—whether a brand new site or a major redesign—the structure of information plays a crucial role in shaping the user experience. Card sorting offers a powerful, flexible tool to ensure that this structure aligns with how users actually think and behave.
Knowing when to apply it (during discovery, before wireframes, or to resolve complex navigation challenges) and how to conduct it thoughtfully (with clear goals, representative participants, and careful analysis) can lead to a site that not only looks good but truly works well for its users.
In our day-to-day we see card sorting as an essential part of our toolkit for building intuitive, user-centered websites. It’s a method that fosters collaboration between designers and users and grounds every navigation and IA decision in real-world insights.
After all, no one knows better how your users think—than your users themselves.