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PPM calculation of customer complaints for PMS


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Hi Bill and Bev, thanks for the input.

I will look into it. The c-chart explanation gave me some ideas to work with.
Bev based on what do you think is best to define the time interval for use?

According to the new EU MDR and ISO 13485 we need to monitor the risk in the market (PMS / Post production feedback), as I understood against the difined risks levels (which include indeed risks that are not acceptable at any level).

Maybe I emphasized to much on ppm. I'm seeking a way to calculate risk levels for PMS, given the delay of customer feedback, that makes sense.
And additional will not be influenced by an increasing sales volume.

I have some ideas for the c-chart but any other suggestion is welcome.
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