Treejack, is an interesting online tool for testing site structures brought to you by OptimalWorkshop. Simply, a site map composed of categories and subcategories can be presented to users in conjunction with a number of tasks. The individual tasks which are given to participants, force them to select a particular category or subcategory to satisfy the task. Once a number of tests from separate participants have been collected, a results overview page is also available to the researcher. Treejack, then could be a useful tool for the information architect types who wish to test a categorization quickly independent of user interface details.

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