Test Method Validation


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New to the world of GR&R, so I have a quick question.

Are there different techniques to conducting a GR&R, i.e. Anova, Variable or Attribute method or a variable destructive test method? The GR&R is to determine the peel strength of a weld.

What are the pros and cons of each which method would be the most accurate in this case?



Forum Moderator
I recommend that you start by reading my MSA blogs. Since peel strength is a non-replicable (i.e., destructive) test read this blog carefully. Then if you have more specific questions, you can ask them here.

Ron Rompen

Trusted Information Resource
A GRR is not the appropriate tool to determine the peel strength of the weld - that would be a capability study.

The GRR study would be what you use to validate the instrument/tool that is used to MEASURE the peel strength.

Bev D

Heretical Statistician
Super Moderator
TMV is essentially a MSA including Guage R&R, stability, bias, calibration etc. to validate that the test method is able to consistently return the required results. It is typically associated with diagnostic or analytical tests of biological material. So under the control of the FDA or USDA for pharma diagnostics and diagnostic medical devices.

A peel test is not medically diagnostic. If you are in manufacturing of the medical devices or pharma products, the term TMV may be being used inadvertently from the product application…but they are essentially the same thing.

Read Miner’s blogs, or my presentation on MSA in the resources section. In general, you will be using several pairs of welds that have the lowest possibility of variation between them. Can you tell us what the thing is? And basically how the weld is created? In particular are there multiple weld ‘paths’ where several things are welded simultaneously (like a multi-lane highway? Or is it a single welder and a single part welded at a time, like a single lane/car bridge…This will matter in the selection of pairs.
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