Deming 94%

W Edwards Deming: I should estimate that in my experience most troubles and most possibilities for improvement add up to the proportions something like this: 94% belongs to the system (responsibility of management), 6% special (individual/blame/credit). (from Out of the Crisis)

see his Red Bead Experiment

https://digestibledeming.substack.com/p/whos-to-blame

https://management.curiouscatblog.net/2013/04/24/94-belongs-to-the-system/

cf metrics, OKR, A-B test