Table 2.

Likert Scale items of system usability scale (SUS) questionnaire.

No.	Question
1	I think that I would like to use this interface frequently.
2	I found the interface unnecessarily complex.
3	I thought the interface was easy to use.
4	I think that I would need the support of a technical person to be able to use this interface.
5	I found the various functions in the interface were well integrated.
6	I thought there was too much inconsistency in this interface.
7	I imagine that most people would learn to use this interface very quickly.
8	I found the interface very awkward to use.
9	I felt very confident using the interface.
10	I needed to learn a lot of things before I could get going with this interface.