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Some tree-testing tools let you decide when the survey questions will be presented – before the tree test, after, or some of each.
Be careful about asking questions before you present the tasks. Your questions (and any multiple-choice answers you supply) can give away information about the structure of the tree or the terminology you're using in it.
Even if your questions don't explicitly give anything away, they may still have a "priming" effect on the participant, by putting them into a particular mindset before they try your tasks.
In most cases, it’s best to use post-test questionsask survey questions after the tasks, because they won’t affect the tree test itself. While most questions won’t skew your results much, it’s best to be safe.
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Next: Choosing a visual design
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