Question

Which specific UX metric is used to measure the efficiency of touch-gesture navigation for a screen reader user moving through a mobile application interface?

Accepted Answer

The specific UX metric used to measure the efficiency of touch-gesture navigation for a screen reader user is Task Success Rate coupled with Time on Task, often analyzed through the lens of the GOMS model, which stands for Goals, Operators, Methods, and Selection rules. This model predicts how long it takes an expert user to complete a task by breaking it down into the individual mental and physical steps required to interact with an interface. For a screen reader user, the &#x27;operators&#x27; are specific touch gestures, such as swipes or taps, used to navigate through elements. By measuring the time taken to complete a navigation goal, UX researchers can identify if the gesture sequence is efficient or if the user is struggling with an overly complex navigation path. Think of it like calculating the shortest possible route through a building: if a user constantly has to backtrack or tap repeatedly to find a button, the high Time on Task reveals that the interface navigation is inefficient for screen reader access.

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Which specific UX metric is used to measure the efficiency of touch-gesture navigation for a screen reader user moving through a mobile application interface?