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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.