/Insights/Why tree testing & card sorting are essential for UX success

WhytreetestingandcardsortingareessentialforUXsuccess

Apr 14, 2025

3 min. read

Woman working on a laptop surrounded by floating UI elements, representing intuitive digital experiences and human-centered design in modern web development.

Learn how tree testing and card sorting can reveal hidden navigation issues and help you create a seamless, intuitive user experience.

Have you ever launched a website that made perfect sense to your team, only for your users to bounce in seconds? That’s not bad luck—that’s bad navigation.

Instances like that are exactly where human-centered design principles come into play. By continuously learning from your users, refining pathways, and making data-driven decisions, you can ensure your website or product isn’t just functional but also enjoyable and seamless to navigate.

Two of the most powerful methods for effective information architecture are tree testing and card sorting. These research techniques help UX designers understand how users naturally categorize information and how easily they can find what they’re looking for.

Without these tests, you run the risk of developing a navigation structure that only makes sense to your internal team, leaving users confused and frustrated. It can even lead to missed opportunities and lost revenue! Yikes!

Below, we dive into what these methods are, what insights they provide, and how you can implement them to improve your own UX strategy.

What is tree testing?

Tree testing is a usability technique designed to evaluate the effectiveness of a website’s navigation and hierarchy. Instead of testing a fully designed interface, users interact with a simplified text-based version of the site’s structure (that’s where the “‘tree” name comes from). Users are given tasks to locate specific content. Their success rates, time taken, and missteps help determine how intuitive the current structure is.

Tree testing is particularly useful when:

You’re designing or redesigning website navigation
You’re noticing users are dropping off quickly in your analytics or their journeys seem confusing

What is card sorting?

Card sorting, on the other hand, is a research technique used to understand how users group and categorize information. Participants are given a set of content items (digital cards usually) and asked to organize them into groups that make sense.

Different pathways for card sort include:

Open card sort: users create their own categories
Closed card sort: users place items into predefined categories
Hybrid card sort: users have predefined categories provided but can create their own if they’d like

Translating results into actionable improvements

So, you’ve run your tree tests and card sorts—great! Now what?

With the insights you’ve gained from conducting the tests, it’s time to make real, actionable improvements that will help you create a smoother, more intuitive user experience.

Tree testing outcomes

Tree testing outcomes provide actionable insights into navigation effectiveness, revealing areas for improvement. By analyzing user task success and failure patterns, you can identify necessary navigation restructuring, refine category labels for clarity, and optimize hierarchy for efficient information access. In fact, according to the Nielsen Norman Group, tree testing has demonstrated the ability to increase task success rates by up to 50%, highlighting its effectiveness in pinpointing and resolving navigation pain points prior to design implementation.

Card sorting outcomes

Card sorting will help you shape a more user-friendly information architecture by identifying common grouping patterns for where users expect content to be and recognizing what type of category terminology to use. This can then inform your entire language system and be used both internally and externally. Like tree testing, card sorting produces positive outcomes. According to a study conducted by the Nielsen Norman Group, card sorting demonstrated the ability to increase task success rates by up to 60% percent, highlighting its ability to help users identify and categorize information.

Best platforms for tree testing and card sorting

Here at Codal, there are a few tools we use to help run tree tests and card sorts. Feel free to check them out so you can start working through tests of your own.

Tree testing platforms:

Optimal Workshop: a go-to platform for tree tests. Really great analytics and clear nav structure breakouts.
UsabilityHub: allows for quick tree tests and easy-to-read data visualizations.
UX-Tweak: offers AI-powered insights for nav recommendations.

Card sort platforms:

Optimal Workshop: an industry-leading tool for card sorting (plus you can use it for tree test).
Miro: while usually a whiteboard tool, you can build card sorts in here, too. Especially if your organization is already using it.

Leverage tree testing and card sorting to improve UX and drive results

Ultimately, tree testing and card sorting are not just theoretical exercises; they're powerful tools that provide tangible, actionable insights into how your users think and navigate. By investing time in these methods, you can move beyond assumptions and create a user experience that's both intuitive and effective. The data you gather will directly inform design decisions, leading to improved user satisfaction, increased engagement, and ultimately, a stronger bottom line.

Topic

Experience design

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