Time-on-task measurement
Measuring the time spent by the participant to complete a task is not entirely reliable in the survey-based approach. Even though survey tools can measure the time taken or provide buttons for the participants to start and end a timer, it is not possible to see whether the participant was interrupted during the task, or to determine at which point the participant considered the task as begun or ended. As such, for survey-based studies, we prefer to ask how much time the participant subjectively believed the task took them to complete. Bear in mind, however, that people might complete a task within a couple of minutes and may subjectively perceive it to be too long, while others might think it went very quickly. Ultimately, ...
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