# Gage RR for 3 and 10 operators

Six Sigma – iSixSigma Forums Old Forums General Gage RR for 3 and 10 operators

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• #53060

Boon
Participant

I want to measure the Gage R&R of the QC technicians and found a few templates for Gage R&R. These templates are for 3 different operators. Since I have 12 Technicians, can I use the same sheet to measure the R&R 4 times and get similar results from one sheet of 12 technicians?
Regards
Boon

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#187686

Remi
Participant

Hai Boon,
First a warning: be carefull with the sentence “to measure the Gage R&R of the QC technicians”. Operator is only part of the variation sources. A gage r&R investigates the consequences of all variation source of measurement variation (that happen during the experiment). So if you see that Operator 6 shows more variation the reason for that could be the bad SOP and not the person!
Back to your question. I expect that if you measure the r&R 4 times (4 different operators) this will show up as repeatability in the calculations and that is wrong.
Generally one uses a sample of 3 operators from the population of 12. How to choose the 3 is up to you but try to cover the variation of the operators as best as you can (i.e. if it is a visual test use one operator with glasses/lenses and one without; use an old/experienced and a new operator; use a woman and a man; …). The idea is that the sample of 3 is ‘representative’ for all 12.
Remi

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#187698

Mikel
Member

Post an email address and I’ll send you an excel add-in that can
accommodate whatever number of operators you have.You are doing the right thing. Somehow there is this idiocy that has
grown in SS that we only need to do 2 or 3, not all. It’s MSA and all of
the operators, procedures, training, and instrument comprise the
SYSTEM.

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