Table 7.
Functional prototype usability results: mean and standard deviations for the individual SUS questions used in the evaluation phase (1=strongly disagree, 5=strongly agree).
| SUS question | PIs, mean (SD) (n=15) |
RFs, mean (SD) (n=5) |
Overall, mean (SD) (n=20) |
| I think that I would like to use this system frequently | 2.9 (1.5) | 3.6 (0.55) | 3.1 (1.4) |
| I found the system unnecessarily complex | 4.3 (1.0) | 4.4 (0.89) | 4.4 (0.99) |
| I thought the system was easy to use | 4.3 (0.60) | 4.3 (0.84) | 4.3 (0.66) |
| I think that I would need the support of a technical person to be able to use this system | 4.7 (0.60) | 4.0 (1.1) | 4.6 (0.83) |
| I found the various functions in this system to be well integrated | 3.5 (0.76) | 3.4 (0.81) | 3.5 (0.76) |
| I thought there was too much inconsistency in this system | 4.3 (0.87) | 4.0 (1.0) | 4.3 (0.86) |
| I would imagine that most people would learn to use this system very quickly | 4.2 (0.66) | 4.2 (0.45) | 4.2 (0.62) |
| I found the system very cumbersome to use | 4.1 (1.1) | 4.0 (1.2) | 4.2 (1.0) |
| I felt very confident using the system | 3.9 (1.1) | 3.6 (0.55) | 3.9 (0.99) |
| I needed to learn a lot of things before I could get going with this system | 4.3 (1.1) | 3.8 (1.6) | 4.2 (1.1) |