Table 4.

Results of the SUS questionnaire.

Question	Mean (SD)
I thought the system was easy to use.	3.5 (0.7)
I would imagine that most people would learn to use this system very quickly.	3.5 (0.5)
I think that I would like to use this system frequently.	3.3 (0.5)
I found the various functions in this system were well integrated.	3.2 (0.7)
I felt very confident using the system.	3.2 (1.1)
I needed to learn a lot of things before I could get going with this system.	0.9 (1)
I think that I would need the support of a technical person to be able to use this system.	0.7 (1)
I found the system unnecessarily complex.	0.7 (1)
I thought there was too much inconsistency in this system.	0.7 (0.9)
I found the system very cumbersome to use.	0.6 (1)