Tree testing

Tree testing is a usability technique for evaluating the findability of topics in a website. It is also known as reverse card sorting or card-based classification.
A large website is typically organized into a hierarchy (a "tree") of topics and subtopics. Tree testing provides a way to measure how well users can find items in this hierarchy.
Unlike traditional usability testing, tree testing is not done on the website itself; instead, a simplified text version of the site structure is used. This ensures that the structure is evaluated in isolation, nullifying the effects of navigational aids, visual design, and other factors.
Basic method.
In a typical tree test:
Analyzing the results.
The analysis typically tries to answer these questions:
Tools.
Tree testing was originally done on paper (typically using index cards), but can now also be conducted using specialized software.