Hello All, How do I calculate the % GRR for a one sided tolerance? Typically I have a minimum paint thickness specified by the Customer. I can carry out a variable MSA to find the gauge variation, but I can not express this as a percentage of the tolerance, as the tolerance is only one sided. Has anyone found the industry standard relating how to express this - I cannot see in MSA 4th? I appreciate your thoughts about the real statistical validity of this, and also I would like your thoughts on how to explain to Customer Quality engineers and auditors who may be less statistically aware! (I could imagine some explanation compared to process mean, or guard banding based on 3xsigma of the gauge - But I have a problem explaining that we can not calculate a %). Thanks in advance to all.