Even if Gage R&R studies cannot be applied in their purest form, you must be confident that your data represents the process adequately. This can be done by using a Measurement System Drilldown: It prevents you from using data if you do not know where it came from. So, instead of blindly trusting your data, challenge its pedigree, and trace how each available data comes to your database. A tree diagram is the best way to structure the results

The key steps are

  1. Drilldown through the data to find its source components
  2. Challenge each component in terms of possible measurement error (bias or precision)
  3. For each potential source of error, decide if it’s acceptable (within context)
  4. If it is acceptable, document your decision, and move on with the project

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