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Relative user efficiency and SUMI scores.
| Characteristic | Mean (SD) |
| RUS Task 1 (second) | 1.7 (1.3 ) |
| RUS Task 2 (second) | 2.4 (1.4) |
| RUS Task 3 (second) | 2.5 (2.1) |
| RUS Task 4 (second) | 1.2 (0.8) |
| RUS Task 5 (second) | 2.2 (1.3) |
| RUS Task 6 (second) | 3.6 (1.7) |
| RUS Task 7 (second) | 2.2 (1.2) |
| RUS Task 8 (second) | 1.7 (1.3) |
| SUMI Global | 64.40 (4.99) |
| SUMI Efficiency | 60.60 (6.70) |
| SUMI Affect | 67.00 (5.06) |
| SUMI Helpfulness | 60.80 (8.63) |
| SUMI Controllability | 60.30 (5.06) |
| SUMI Learnability | 60.80 (9.21) |
