Best metrics for monitoring low volume (<1000) parts per vendors

CPhelan

Starting to get Involved
Hello,
As part of a global standard metric we use Defective Parts Per Million for monitoring our vendors and reporting global numbers.
For most of our other sites the metric works as they bring in electronic components so their volumes are quite large but for us there are some vendors we may order 20/30 items from a year and one or two failures using this metric criteria make the issue look a lot worse in comparison.

Is there perhaps a better way to measure and report incoming receipt vs defects found at receiving inspection?
 
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