Expiration rules determine when a study task is no longer available to be completed.
You’ll notice that all tasks include a default expiration rule … they expire when the task is completed.
You can add additional rules here as well. The most common would be to expire the task after it’s been assigned, but not completed, for a certain period of time (known as a window period). This is a classic study design process. If you leave a measurement open to long after an intervention, the data you get back from participants will all be at different time intervals, making it difficult to create any meaning out of the data.
Or, you may want to expire a task on a certain date. This works particularly well for situations where there is an external event on a specific date.