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The same rough markers we used for overall scores hold true for individual tasks:
| Success score | Meaning |
|---|---|
| 0-50 | Most participants had real trouble with the task. If they understood the task properly, then the tree failed to do its job. If they didn’t understand the task ( |
| see Where they went later in this chapter), then |
| we won’t be able to judge the tree based on this task alone. | |
| 50-65 | A mixed bag: most found it, but quite a few didn’t. This usually indicates that the tree is roughly right for this task, but there are specific topics that are luring some users off the correct paths. |
| 65+ | Most participants succeeded. |
| The tree is performing well for this task, and probably only needs minor tweaks to corral the wayward few. |
Success rate is a good general indicator of the effectiveness of our tree, but immediately we want to dig deeper. For example, if we have a success rate of 27% on a task, we naturally want to ask “Where are all these people going wrong?”. For that, we need to look at the paths they took through our tree.
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