Table 6.
Frequencies of usability errors and task success rates.
| Cognitive | Physical/perceptual | No Difficulties | Organizational | Feedback | Physical/perceptual | No Slips | Task successa | |
|---|---|---|---|---|---|---|---|---|
| Deliver | 14 (73.6%) | 0 (0%) | 5 (26.3%) | 1 (5.3%) | 2 (10.5%) | 0 (0%) | 16 (84.2%) | 5 (26.3%) |
| Help | 9 (47.4%) | 1 (5.3%) | 9 (47.4%) | 13 (68.4%) | 4 (21.1%) | 0 (0%) | 2 (10.5%) | 9 (47.4%) |
| Load | 13 (68.4%) | 3 (15.8%) | 3 (15.8%) | 3 (15.8%) | 2 (10.5%) | 12 (63.2%) | 2 (10.5%) | 3 (15.8%) |
| Manual drop | 16 (84.2%) | 1 (5.3%) | 2 (10.5%) | 9 (47.4%) | 4 (21.1%) | 0 (0%) | 6 (31.6%) | 2 (10.5%) |
| Remove pill | 7 (36.8%) | 1 (5.3%) | 11 (57.9%) | 0 (0%) | 0 (0%) | 10 (52.6%) | 9 (47.4%) | 11 (57.9%) |
| Unload | 10 (52.6%) | 1 (5.3%) | 8 (21.0%) | 6 (31.6%) | 3 (15.8%) | 1 (5.3%) | 9 (47.4%) | 8 (21.0%) |
| View inventory | 7 (36.8%) | 1 (5.3%) | 11 (57.9%) | 5 (42.1%) | 5 (47.4%) | 0 (0%) | 9 (47.4%) | 11 (57.9%) |
*The frequencies were calculated such that every task, subject, and error type was either present (1) or absent (0).
a
Task Success is the number of subjects that successfully completed each task. Percentage of task success among the 19 subjects is shown in parenthesis.