Judged: two independent readers; copy check clear.
unobtrusive measure
unobtrusive measure An unobtrusive measure is an indirect way of assessing a person during an activity by using behavior that occurs as part of the task itself, such as the steps taken while navigating.
An unobtrusive measure is an indirect way of assessing a person during an activity by using behavior that occurs as part of the task itself, such as the steps taken while navigating. In this context, it is used to estimate things like disorientation or learning-related performance without interrupting the activity.