Tree testing is a usability technique for evaluating the findability of topics in a website.
[1] It is also known as reverse card sorting or card-based classification.
[2] A large website is typically organized into a hierarchy (a "tree") of topics and subtopics.
[3][4] Tree testing provides a way to measure how well users can find items in this hierarchy.
[1] This ensures that the structure is evaluated in isolation, nullifying the effects of navigational aids, visual design, and other factors.