What is Card Sorting?
A user research method where participants organize topics into groups and label categories, used to inform information architecture and navigation design.
Card Sorting Explained
Card sorting is a research technique used to understand how users categorize and relate information. Participants are given cards representing content items or topics and asked to sort them into groups that make sense to them. In open card sorting, participants create and name their own categories. In closed card sorting, participants sort cards into predefined categories. In hybrid card sorting, participants use predefined categories but can also create new ones. The results reveal user mental models and inform decisions about content organization, navigation labels, and taxonomy design. Card sorting can be conducted in person with physical cards or remotely using digital tools, and typically requires 15-30 participants for reliable patterns.
Frequently Asked Questions
When should you use card sorting?
Use card sorting when designing a new site or content hub, restructuring existing content, validating a proposed navigation structure, or when analytics show users cannot find content. It is most valuable early in the design process before committing to a structure.
What is the difference between open and closed card sorting?
In open card sorting, participants create their own category names, revealing how they naturally think about the content. In closed card sorting, categories are predefined and participants place items into them, testing whether an existing structure works. Open sorting is exploratory; closed sorting is evaluative.
How many participants do you need for card sorting?
For open card sorting, 15-30 participants typically reveal clear patterns. For closed card sorting, 15-20 participants is usually sufficient. Remote card sorting tools make it easy to recruit larger samples. Diminishing returns set in beyond 30 participants for most studies.
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