Table 3 Usability issues identified in the second design iteration’s usability testing focus group
Theme | Usability issue | Heuristic | Number of participants reporting the issue (n = 8) |
|---|---|---|---|
Readability | The words in the tutorial are too small | Reduce uncertainty | 2/8 |
The word on the line is too close to the line | Reduce uncertainty | 1/8 | |
Long response time | The loading time for queries is too long | Reduce uncertainty | 5/8 |
Information presentation | The web application layout design is initially not easy to understand | Present new information with meaningful aids to interpretation | 1/8 |
The search box should be on the top | Automate unwanted workload | 2/8 | |
The text in the node should be maintained by word level | Automate unwanted workload | 1/8 | |
Some nodes will be out of the viewport after node dragging | Reduce uncertainty | 1/8 | |
It is hard to find the most important information from the result | Include in the displays only that information needed by the user at a given time | 1/8 | |
Lack of functionalities | There should be a way to cancel delete node operation | Automate unwanted workload | 2/8 |
Search history is needed | Automate unwanted workload | 2/8 | |
Incomplete functionality | The tutorial should be more comprehensive | Automate unwanted workload | 2/8 |
Sometimes the disease node can’t expand | Reduce uncertainty | 1/8 | |
The arrow should be a double direction | Reduce uncertainty | 1/8 |