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FMEA-Rating Chart

1. The document provides guidelines for rating the severity, occurrence, and detectability of potential failures in a Failure Modes and Effects Analysis (FMEA). 2. Severity is rated from 1 to 10 based on the effect of the failure on the customer, from minor/insignificant to catastrophic. Occurrence is rated based on the likelihood of the failure occurring, from not likely to failures nearly always occurring. 3. Detectability is rated based on the estimated probability (p) of the failure not being detected before reaching the customer, from nearly certain detection to nearly certain no detection.

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Tushar Wagh
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2K views1 page

FMEA-Rating Chart

1. The document provides guidelines for rating the severity, occurrence, and detectability of potential failures in a Failure Modes and Effects Analysis (FMEA). 2. Severity is rated from 1 to 10 based on the effect of the failure on the customer, from minor/insignificant to catastrophic. Occurrence is rated based on the likelihood of the failure occurring, from not likely to failures nearly always occurring. 3. Detectability is rated based on the estimated probability (p) of the failure not being detected before reaching the customer, from nearly certain detection to nearly certain no detection.

Uploaded by

Tushar Wagh
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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PREETI ENGINEERING WORKS,

L-46,MIDC-AMBAD,NASHIK (422010)

FMEA Severity, Likelihood and Detectability Rating Guidelines

Severity (SEV) Occurrence (OCC) Detectability (DET)

RATING How likely will the existing system detect the cause if it occurs?
How significant is this failure’s effect to the customer? How likely is the cause of this failure to occur?
Note: p is the estimated probability of failure not being detected.

Minor. Customer won’t notice the effect or will consider it


1 Not likely Nearly certain to detect before reaching the customer (p » 0)
insignificant.

2 Customer will notice the effect. Documented low failure rate Extremely low probability of reaching the customer (p £ 0.01)

Low probability of reaching the customer without detection.


3 Customer will become irritated at reduced performance. Undocumented low failure rate
(0.01 < p £ 0.05)
Marginal. Customer dissatisfaction because of reduced Likely to be detected before reaching the customer (0.05
4 Failures occur from time to time.
performance. < p £0.20)
It might be detected before reaching the customer. (0.20
5 Customer’s productivity is reduced. Documented moderate failure rate
< p £0.50)
Customer will complain. Likely to request repair or return. Unlikely to be detected before reaching the customer. (0.50
6 Undocumented moderate failure rate
Increased internal costs (scrap, rework, etc.) < p £0.70)
Critical. Reduced customer loyalty. Internal operations Highly unlikely to detect before reaching the customer (0.70
7 Documented high failure rate
adversely affected < p £ 0.90)
Complete loss of customer goodwill. Internal operations Poor chance of detection
8 Undocumented high failure rate
disrupted (0.90 < p£ 0.95)
Customer or employee safety compromised. Regulatory
9 Failures common Extremely poor chance of detection (0.95 < p £ 0.99)
compliance questionable
Catastrophic. Customer or employee endangered without
10 Failures nearly always occur. Nearly certain that failure won’t be detected (p » 1)
warning. Violation of law or regulation.

PREPARED BY- Mr.Tushar WAGH APPROVED BY- Mr.Ravindra Vamborkar


(Design & Development Engineer) (System & Quality Head)

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