Table 4.
System usability scale (N=12).
| Questionnaire items | Cycle 1, mean (SD)a | Cycle 2, mean (SD)a |
| 1. I think that I would like to use this website frequently (+)b | 3 (0.8) | 4 (0.5) |
| 2. I found the website unnecessarily complex (−)c | 2 (0.7) | 3 (0.9) |
| 3. I thought the website was easy to use (+)b | 2 (0.6) | 3 (0.0) |
| 4. I think that I would need the support of a technical person to be able to use this website (−)c | 3 (1.08) | 4 (0.5) |
| 5. I found the various functions in the product were well integrated (+)b | 3 (0.5) | 3 (0.5) |
| 6. I thought there was too much inconsistency in this website (−)c | 3 (0.4) | 4 (0.5) |
| 7. I imagine that most people would learn to use this product very quickly (+)b | 2 (0.7) | 3 (0.4) |
| 8. I found the website very awkward to use (−)c | 3 (0.5) | 4 (0.5) |
| 9. I felt very confident using the website (+)b | 2 (0.4) | 3 (0.4) |
| 10. I needed to learn a lot of things before I could get going with this website (−)c | 2 (0.9) | 3 (0.4) |
| Total score of items 1, 3, 5, 7, and 9 | 2.4 (0.5) | 3.2 (0.6) |
| Total score of items 2, 4, 6, 8, and 10 | 2.6 (0.7) | 3.6 (0.5) |
| Total score | 25 (3.4) | 34 (3.2) |
| SUSd scoree | 62 (8.5) | 84 (8.2) |
aRating scale, 1=strongly disagree and 5=strongly agree.
bFor items 1, 3, 5, 7, and 9, the score contribution is the scale position minus 1.
cFor items 2, 4, 6, 8, and 10, the contribution is 5 minus the scale position.
dSUS: system usability scale.
eSUS score=total score×2.5.