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| Probability of failure | Possible failure rates | Rank |
| Extremely high: failure almost inevitable | ≧1 in 2 | 10 |
| Very high | 1 in 3 | 9 |
| Repeated failures | 1 in 8 | 8 |
| High | 1 in 20 | 7 |
| Moderately high | 1 in 80 | 6 |
| Moderate | 1 in 400 | 5 |
| Relatively low | 1 in 2000 | 4 |
| Low | 1 in 15,000 | 3 |
| Remote | 1 in 150,000 | 2 |
| Nearly impossible | ≦1 in 1,500,000 | 1 |
