Table 1.

Usability metrics

Metric	Description
Effectiveness	Degree of success achieved in the execution of a task, measuring the deviation of the user result from the reference result and differentiating between tasks that have reached any of their objectives and tasks that have failed
Relative user efficiency	Deviation with respect to the efficiency of the expert user that performs the same task, with the same results, under the same conditions
User-perceived usability	User satisfaction and perception of the degree of success achieved in operating the tool, measured in the Computer System Usability Questionnaire (CSUQ) [47]