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During product design we typically flesh out a scenario in story form (for an example, see the Functional Requirements"Lightbox" scenarios). For purposes of the UI walkthrough, we'll use fairly high level scenarios. It will be up to each evaluator to utilize their knowledge of users in determining the details of the activity. Having several evaluators focus on the same scenarios will help ensure we cover the various typical paths through a scenario. Capturing the steps you take through scenario is valuable information.
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