Gap in FMEA Occurrence Rating Standard

L

lovableharry

#1
Dear All,

Can you please clarify the occurrence rating method. There is no specific rule given how to see the rating is FMEA standard.

Example

If we consider:

From bottom to top occurance rating will be
<0.001 - 2,
0.001 to 0.01 - 3
0.01 to 0.1 - 4
0.1 to 0.5 - 5
0.5 to 2 - 6
2 to 10 - 7
10 to 20 - 8
20 to 50 - 9
50 to 100 ???? or
> 100 - 10

Top to bottom
> 100 - 10
100 to 50 - 9
50 to 20 - 8
20 to 10 - 7
10 to 2 - 6
2 to 0.5 - 5
0.5 to 0.1 - 4
0.1 to 0.01 - 3
0.01 to 0.001 ???? or
< 0.001 - 2

Questions:
1. If rejection is 30 per thousand what is the occurrence rating?? As per top to bottom its 8, as per bottom to top its 9, Whether it will be in 9 or 8?
2. While fixing occurrence we need to see from top to bottom or bottom to top?
3. If we considering rating from bottom to top, what is rating we need to give if rejection 50 to 100??
4 If we considering rating from top to bottom, what is rating we need to give if rejection 0.01 to 0.001??

Herewith I have attached the excel sheet. Please go through and clarify the questions mentioned.

:thanx:

Hari
 

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Chennaiite

Never-say-die
Trusted Information Resource
#2
How are you Hari.
I suggest to not complicate on the rating standard. These are just guidelines to help us quantify the likelihood of occurrence of potential causes. There is absolutely no point in conflicting between 8 and 9 or 3 and 4 like. The team decision prevails. At the end of it, what is important is your FMEA reflecting risk to the realistic extent possible. I suggest after giving ratings just come out of it and evaluate the team feeling of the risk as product/process experts. If the team plays down on risk, while the FMEA on paper plays it up or vice versa, I would revisit the ratings again. It is important to be flexible while making analysis.
 
A

andtyl

#3
I agree.

Realistically, what would you do different in your preventions and detections depending on whether the occurance is 8 or 9? Either way, unless the severity is very low and the detection is very good, the occurance is too high.
 
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