6.1.1. Task success
With many tasks, whether the users were successful is a clear binary decision: either they accomplished the task or they didn't. But in some cases, there may be more than one correct answer or there may be shades of gray between success and failure.
Binary task success
To take a real example, consider our study of an online photo clip-art gallery. In this study, each of the tasks involved finding the full-size version of a thumbnail image they were shown. In the example shown in Figure 6.1, the participant's task is to find the image of the light bulb shown in the top window by navigating in the lower window. In this screenshot, the participant has navigated to the correct category using the outline on the left; that ...
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