同样，确保参与者知道可用性测试时间需要多久，希望他们执行的任务类型是什么。
Also, ensure that participants know how long the usability testing will take, and the type of tasks they will be expected to perform.
他们还发现，使用免提设备的小组在执行任务时比不使用免提设备的小组多犯83%的错误。
They also found that the group using the hands-free kit made 83% more errors in their tasks than those who were not talking.
当科学家们现在想到，未来的机器会执行大型复杂任务时，他们想到的是比以前更小的（机器）。
When scientists now think about future machines doing large and complex tasks, they're thinking smaller than ever before.
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