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Does anyone know of a good resource to provide information and instruction in how to perform and analyze GR&R studies for destructive and non-repeatable measurement such as Brinell hardness. I have read the AIAG MSA manual and MiniTab help topics (nested study) but did not get a good understanding in how to perform the test and analyze the results. I have struggled with whether to use production parts or standards. The production parts did not appear to represent a homogeneous sample, but I may be the problem and not the parts. Thanks