FMEA Ranking Rating Best Practices

B

benzkumar

#1
Severity ? 8 Severity ? 2 Severity - 2
Occurrence ? 2 Occurrence ? 2 Occurrence - 8
Detection -2 Detection ? 8 Detection ? 2

Can somebody explain me which is the best process & which is worse from the above?

Thanks,
Selva
 
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Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#2
Re: FMEA Rating Best Practices

What is the product or part? Or is this a question from a training/school course?

AIAG "Standard" FMEA Rating System


Six Sigma "Standard" FMEA Rating System
 
B

benzkumar

#3
Re: FMEA Rating Best Practices

Hi Marc,

This is a Interview question, not related to any parts/product

Thanks,
Selva
 
G

guruprasadb

#4
Based on FMEA manual
Case 1
Severity – 8 Occurrence – 2 Detection – 2
Severity is ranked 8 Means ---- Loss of primary function / 100 % product to be scrapped
Occurance is ranked 2 Means ---- 1 part in 1,000,000 ( LOW OCCURANCE)
Detection is ranked 2 means ------ in station only part error is detected / prevented making discrepant part
Case 2
Severity – 2 Occurrence – 2 Detection – 8
Severity is ranked 2 Means ---- noticed by discriminating customer 25% / Slight incovienince to operator or process
Occurance is ranked 2 Means ---- 1 part in 1,000,000 ( LOW OCCURANCE)
Detection is ranked 8 means ------ failure detection is post process by visual or by audible means

Case 3
Severity – 2 Occurrence – 8 Detection – 2
Severity is ranked 2 Means ---- noticed by discriminating customer 25% / Slight incovienince to operator or process
Occurance is ranked 8 Means ---- 1 part in 50
Detection is ranked 2 means ------ in station only part error is detected / prevented making discrepant part


To me case 1 is best even though severity is high, Occurance is low and detection prevents the problem to next stage
Case 3 is worst -occurance is high
 
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Chennaiite

Never-say-die
Trusted Information Resource
#5
Severity ? 8 Severity ? 2 Severity - 2
Occurrence ? 2 Occurrence ? 2 Occurrence - 8
Detection -2 Detection ? 8 Detection ? 2

Can somebody explain me which is the best process & which is worse from the above?

Thanks,
Selva
If I were to answer in an interview taking this Question at face value, I would say, the devil's in the details. Then, ofcourse, I could follow it with lot of Ifs and Buts to prove myself.
 

harry

Super Moderator
#6
............... Then, of course, I could follow it with lot of Ifs and Buts to prove myself.
I think this is the purpose of the question. I think the person who drafted the question is not really looking for a specific right answer, rather to test the ability of the candidate to think and argue his case on reasonable grounds. Candidates who do not have a reasonably good grasp of the subject will be filtered.
 

Ron Rompen

Trusted Information Resource
#7
The question is which is the 'best' process, and which is the 'worst' process.

From the information given, the 'worst' is the one with the highest probability of occurrence (assuming that the PFMEA was developed using historically accurate data). The best would be the process with the lowest probability of occurrence.

Fortunately, this relates to a severity of 2 (again presuming that it was accurately assigned) and so even when the failure DOES occur, there is a strong probability of it being detected, and if it escapes, the net effect to the customer is minimal.
 
J

JaxQC

#8
Devil?s Advocate -
Engineering perspective
#1 worst ? 8 sev, Customer Dissatisfaction and close to Safety/Regulatory issue, major disruption in surgery or 100% scrapped (can?t rework)
#3 best ? 8 occ ? with a higher occurrence it?ll be easy to track down the root cause issue and correct it, high detection is little risk of it getting out in the interim.

Quality perspective
#1 best ? Low occurrence + high detection
#2 worst ? 8 det Visual detection, remote at best, other 2 scenarios cannot pass discrepant parts so limited worry

Other thoughts?.
 
M

manojdparab

#9
Severity ? 8 Severity ? 2 Severity - 2
Occurrence ? 2 Occurrence ? 2 Occurrence - 8
Detection -2 Detection ? 8 Detection ? 2

Can somebody explain me which is the best process & which is worse from the above?

Thanks,
Selva
In my opinion,
Case 1- is the best, as the occurence & Detection rating are low.
Case 2- is also OK, since the occurence is low, ofcourse detection is high but need not to focus on it as severity is low. Focus shoud be given on other defects with high severity or occurence. That does not mean you should ignore it.
Case 3- is NOT OK as the occurence is high, which will result in waste (7 types of waste). Also need to review on detection rating or validate detection mechanism, coz the detection of 2 means Error (cause) detection in station with automated controls which will prevent the discrpant part from being made.
I hope it is clear.

Regards
Manoj Parab
 
M

mayank_thkkr

#10
In one of the Management training I learnt a good response to every such situation which does not have any fixed answer. The response is "It depends". Then it is up to the person to display his/her knowledge on the subject, and provide valuable argument.

Coming back to the question, As explained in AIAG FMEA manual 4th edition, there can also be an alternative approach for risk prioritization apart from traditional RPN methodology, We use in our case SOD. (Writing down the S O and D digits to form a number, and if the number is less than 10 prefix it with 0)

Going by this your given scenario comes as follow

Sev Occr Det RPN SOD

Case 1 8 2 2 32 080202
Case 2 2 2 8 32 020208
Case 3 2 8 2 32 020802



Arrange the SOD value obtained in Descending order and you have your answer. Highest being the worst process and Lowest being the COMPARATIVELY Best process within three.

:evidence:
 
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