Table 3. Usability problems in the UAF physical action phase with their severity and potential effect on task outcome.
| ID No. | Level 1 | Level 2 | Level 3 | Level 4 | Description of usability problem | No.1 | Severity | Identifying potential outcomes2 |
|---|---|---|---|---|---|---|---|---|
| 16 | Physical actions | Manipulating objects | Physical layout | To view the complete resistance overview, which shows the culture history, the user has to scroll down in the resistance viewer. The user does not scroll down in this viewer. | 1 | 2 | None | |
| 17 | Manipulating objects | Preferences and efficiency | User wants to review the culture history, when advice is generated, but this is not possible (functionality not available). User thinks this is not convenient, because the user wishes to review this history while consulting an infectious diseases consultant. | 1 | 43 | None | ||
| 18 | Manipulating objects | Preferences and efficiency | Physician mentions that she misses a button (button does not exist in the system). There is only the possibility to answer ‘yes’ or ‘no’ on the question if patient has been abroad. She mentions there has to be a button ‘unknown’. | 1 | 2 | None | ||
| 19 | Perceiving physical objects | Perceiving objects as they are being manipulated | The user tries to click through the resistance viewer, which shows the culture history. This is not possible (this functionality is not available in the system) | 1 | 13 | None |
1The number of usability problems with the same classification path, in the interaction of different or the same user with the system.
2The mentioned outcomes are potential and did not have to occur.
3.The difference in severity between these 2 usability problems stands out. The usability problem ‘The user tries to click through the resistance viewer, which is not possible’ is scored as 1 (cosmetic problem), because it has a low impact on the user interaction, the problem only occurred once and is an usability problem which is not persistent.