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Most common classifications for the possible causes for the failure shown in the IMRT fault tree analysis in Appendix E (Ref. 141).
| Category | Occasions |
|---|---|
| Human failures | 230 |
| Lack of standardized procedures | 99 |
| Inadequate training | 97 |
| Inadequate communication | 67 |
| Hardware/software failure | 58 |
| Hardware | 9 |
| Software | 44 |
| Hardware or software | 5 |
| Lack of staff | 37 |
| Inadequate design specifications | 32 |
| Inadequate commissioning | 18 |
| Use of defective materials/tool/equipment | 12 |
