Table 5.
Analysis of usability problems.
| Usability problem type | Description | Frequency | Severitya | |
| Bosc | ||||
| Using a well-known interface element in a virtual environment | Selecting and moving sliders to desired position | 7/8 | Medium | |
| Using a well-known interface element in a virtual environment | Using the annotation tool | 7/8 | Medium | |
| Software errors | Delayed slider movements | 1/8 | Low | |
| Slider sensitivity | Higher sensitivity requires users to be cautious | 3/8 | Medium | |
| Medical Holodeck | ||||
| Using a well-known interface element in a virtual environment | Rotating the heart model | 3/8 | Low | |
| Using a less commonly known interface element | Creating and removing cut planes | 6/8 | Medium | |
| Using a less commonly known interface element | Turning ring filters on and off | 6/8 | Medium | |
| Using a less commonly known interface element | Adjusting ring filter resolution to specification | 6/8 | Medium | |
aSeverity scale: low: task was delayed; workaround unnecessary; medium: task was delayed, workaround was necessary, or moderator helped the user; high: task was delayed or left incomplete, user couldn’t complete the task even with moderator’s assistance.