Which scoring approach assesses "effectiveness" in usability?

The selection focuses on evaluating how well users can achieve their desired outcomes, which is a key aspect of assessing the effectiveness of usability. This approach takes into account the end goals of the users and whether they can successfully navigate through an interface to achieve those goals. When users can complete tasks effectively, it indicates that the interface is not only user-friendly but also aligned with the users' objectives.

By contrasting this with other approaches, counting user errors during task completion primarily focuses on identifying issues rather than measuring overall effectiveness. Measuring the time taken to perform tasks can indicate efficiency, but not necessarily whether users achieve their desired outcomes. Determining user satisfaction provides insights into users' feelings about the interface but does not directly measure their success in completing tasks. Thus, evaluating how well users can achieve their desired outcomes is the most comprehensive way to assess effectiveness in usability.