I've been a strong supporter of ISO 9000 since the late 90's, and I continue to sing its praises. However, I'm currently writing an essay on the standard, and I want to include of all the pros and cons of it. Almost every article I find discusses the positive sides of the standard. Can anyone recommend good articles or books that criticize the new standard? Please be a specific as possible when citing such articles, as I will need to locate them from the information provided.
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hershal 7/23/2002
The "round robin" tests will give you a feel for the proficiency of each operator, compared to the other operators. That is not bad, it simply lets you know what level everyone is at.
"Acceptable" in this context will likely mean that if there is a published specification (from the manufacturer, ASTM, etc.) that will be the specification to meet. The first step for you is to establish what the specification is that the operators must meet.
That assumes that the item(s) to be tested is/are appropriate for that specification, and that the machines are calibrated, preferably by an accredited laboratory.
If you want to know how proficient your operators are compared to other companies, then you would participate in a proficiency test or inter-laboratory comparison (PT/ILC).
Hope this helps.
Hershal
cscramuzza 8/6/2002
If you find that there is no published specification, a general rule of thumb for Repeatability and Reproducibility studies is that operator, gage variation or a combination of both should not account for a greater consumption of the actual measurement tolerance than 28%. Statistical packages such as Minitab or something similar can be very helpful with R&R study calculations and graphs, especially if you are interested in checking the accuracy of both your operators and multiple gages.