Table 2 The number of the identified problems per method and usability group
From: A combination of two methods for evaluating the usability of a hospital information system
Heuristics evaluation N (%) | Think aloud N (%) | Think aloud + Heuristics evaluation N (%) | Both Think aloud and Heuristics evaluation N (%) | Only Think aloud N (%) | Only Heuristics evaluation N (%) | |
|---|---|---|---|---|---|---|
Satisfaction | 120 (44.6) | 113 (43.46) | 190 (45) | 43 (40.5) | 70 (45.45) | 77 (47.23) |
Effectiveness | 23 (8.5) | 26 (10) | 34 (8) | 15 (14.15) | 11 (7.14) | 8 (4.9) |
Efficiency | 20 (7.5) | 45 (17.3) | 53 (12.5) | 12 (11.35) | 33 (21.43) | 8 (4.9) |
Learnability | 38 (14.12) | 26 (10) | 53 (12.5) | 11 (10.4) | 15 (9.75) | 27 (16.57) |
Error | 68 (25.28) | 50 (19.24) | 93 (22) | 25 (23.6) | 25 (16.23) | 43 (26.4) |
No. of usability problems | 269 | 260 | 423 | 106 | 154 | 163 |
Percentage of the problems identified by the two methods to the total number of problems | 25% | 36% | 39% |