Table 1.

Questionnaire items and description based on the NASA TLX test. The first five questions were given a rating between 1 and 10.

Dimension	Question
Mental demand	How mentally demanding was the task?
Temporal demand	How hurried or rushed was the pace of the task?
Performance	How successful were you in accomplishing what you were asked to do?
Effort	How hard did you have to work to accomplish your level of performance?
Frustration	How insecure, discouraged, irritated, stressed and annoyed were you?
Task ranking	Which are your preferred tasks, in order of importance?