I have some questions about Attribute Measurement System.

1. I want to know what is the definition of Attribute Measurement System.
Note: I haven't the English version MSA Manual. I come from China.:)

2. Where does Attribute Measurement System apply?

3. For Attribute GR&R of visual quality inspection, What is the assess criteria?
The %Score vs. Attribute need to >90%? or the Screen % Effective Score vs Attribute>80%?

Any input will be highlighted appreciated. Thanks!:thanx:

I have some questions about Attribute Measurement System.

1. I want to know what is the definition of Attribute Measurement System.
Note: I haven't the English version MSA Manual. I come from China.:)

There are people here in the US who think the MSA manual is written in Chinese :D. "Attributes" are characteristics for which acceptance criteria are based on simple good/not good, or go/no go decisions, as opposed to variables, for which actual measurement values form the acceptance criteria.

2. Where does Attribute Measurement System apply?
See the answer to #1. One example of an attributes measurement system is use of thread gages to verify screw threads, or threaded holes.

3. For Attribute GR&R of visual quality inspection, What is the assess criteria?
The %Score vs. Attribute need to >90%? or the Screen % Effective Score vs Attribute>80%?

The acceptance criteria will depend on the risk involved, customer requirements, or both. Generally speaking, it's expected that an attributes gage will always differentiate between "good" and "bad" parts. When there are subjective visual criteria, GR&R is not appropriate. In order for GR&R to be useful, the acceptance criteria must be objective.

1. I want to know what is the definition of Attribute Measurement System.


2. Where does Attribute Measurement System apply?

3. For Attribute GR&R of visual quality inspection, What is the assess criteria?
The %Score vs. Attribute need to >90%? or the Screen % Effective Score vs Attribute>80%?


OK let's anwer 1 by 1:
1. Attribute Measurement System is also known as Assesement Agreement Analysis. It is a study of whether 2 or more appraisers are given sets of items will agree each other with thier judgment of GO/NO, or PASS/FAIL. Usually appraisers are given 2 or more trials.

2. Mostly during inspection where judgment is by attribute data (go/no go; pass/fail; small/medium/large) and measurement is not used.

3. Depends on the criticality of your product. Ours is 95% sine there is a relability issue involved.


Try to use the Search function for more info or
refer this weblink for whole lot of information
http://elsmar.com/Forums/forumdisplay.php?f=91


You may check this site for some samples:
http://cpd.ogi.edu/seminars05/DonLewisSeminar.pdf

Hope that helps:D
>>rey

There are people here in the US who think the MSA manual is written in Chinese :D. "Attributes" are characteristics for which acceptance criteria are based on simple good/not good, or go/no go decisions, as opposed to variables, for which actual measurement values form the acceptance criteria.


See the answer to #1. One example of an attributes measurement system is use of thread gages to verify screw threads, or threaded holes.



The acceptance criteria will depend on the risk involved, customer requirements, or both. Generally speaking, it's expected that an attributes gage will always differentiate between "good" and "bad" parts. When there are subjective visual criteria, GR&R is not appropriate. In order for GR&R to be useful, the acceptance criteria must be objective.

OK let's anwer 1 by 1:
1. Attribute Measurement System is also known as Assesement Agreement Analysis. It is a study of whether 2 or more appraisers are given sets of items will agree each other with thier judgment of GO/NO, or PASS/FAIL. Usually appraisers are given 2 or more trials.

2. Mostly during inspection where judgment is by attribute data (go/no go; pass/fail; small/medium/large) and measurement is not used.

3. Depends on the criticality of your product. Ours is 95% sine there is a relability issue involved.


Try to use the Search function for more info or
refer this weblink for whole lot of information
http://elsmar.com/Forums/forumdisplay.php?f=91


You may check this site for some samples:
http://cpd.ogi.edu/seminars05/DonLewisSeminar.pdf

Hope that helps:D
>>rey

I am a new guy to this forum;) .Thanks your help!

BTW, Our company is a PCB manufactory.
I would like to set up the standard procedure for Attribute GR&R in our company.


"3. Depends on the criticality of your product. Ours is 95% sine there is a relability issue involved."
What is the mean of 95%? It is %Appraiser? %Score vs.Attribute? Screen %Effective Score? Screen %Effective Score vs. Attribute?