Example of Observed Use Problems by Critical/Essential Use Steps
| Use Step | Use Errors | Close Calls | Difficulties |
|---|---|---|---|
| Remove pen cap | 0 | 0 | 0 |
| Attach needle | 1 | 1 | 1 |
| Select dose | 8 | 4 | 4 |
| Insert needle into injection site | 2 | 0 | 1 |
| Inject dose | 3 | 6 | 5 |
| Remove needle from injection site | 0 | 0 | 0 |
| Dispose of used needle | 1 | 1 | 0 |