Potential Failure Causes rated according to the criteria below. Consider Prevention Controls when determining the best Occurrence estimate. Occurrence is a predictive qualitative rating made at the time of evaluation and may not reflect the actual occurrence. The occurrence rating number is a relative rating within the scope of the FMEA (process being evaluated). For Prevention Controls with multiple Occurrence Ratings, use the rating that best reflects the robustness of the control
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Prediction of Failure Cause Occuring
Type of Control
Prevention Controls
Corporate or Product Line Examples
10
Extremely high
None
No prevention controls
9
Very high
Behavioral
Prevention controls will have little effect in preventing failure cause.
8
7
High
Behavioral or Technical
Prevention controls somewhat effective in preventing failure cause
6
5
Moderate
Prevention controls are effective in preventing failure cause.
4
3
Low
Best Practices: Behavioral or Technical
Prevention controls are highly effective in preventing failure cause
2
Very low
1
Extremely low
Technical
Prevention controls are extremely effective in preventing failure cause from occurring due to design (e.g. part geometry) or process (e.g.fixture or tooling design). Intent of prevention controls - Failure Mode cannot be physically produced due to the Failure Cause.
