Timebox

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A fixed, agreed limit of time set aside for an activity, after which the person stops and reflects regardless of whether the work feels finished. In exploratory testing, a timebox keeps a session focused and reduces the fear that testing will expand without end, since the tester stays in control of how long the work takes.

It also turns the outcome into useful information: if little progress is made within the box, that itself signals something about the change being tested.

For example: giving yourself one hour to explore a feature and debriefing at the end; spending ten minutes generating test ideas before looking at the product; or running a thirty minute session and then deciding whether to go again.
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