Research Article
Risk Analysis of Coupling Fault Propagation Based on Meta-Action for Computerized Numerical Control (CNC) Machine Tool
Table 1
Qualitative classification of meta-action failure mode level [
34].
| Level | S | O | D |
| 1 | No | Almost never | Almost certain | 2 | Very slight | Remote | Very high | 3 | Slight | Very slight | High | 4 | Minor | Slight | Moderate high | 5 | Moderate | Low | Medium | 6 | Significant | Medium | Low | 7 | Major | Moderately high | Slight | 8 | Extreme | High | Very slight | 9 | Serious | Very high | Remote | 10 | Hazardous | Almost certain | Almost impossible |
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