[hef19898]

Very interesting to get the perspective of someone who did thisbin a non-manufacturing evironment. One interesting bit, for someone like me who knows SPC from manufacturing related processes, are the discussions around what a stable process is. Because I cannot remember a single of those discussions ever in manfucturing related fields. Intriguiging, especially since on HN sometimes discussion miss the point by turning into disputes about the exact definition of a term, something that sounds very similar to the "misunderstandings" about stuff like special-casue variation you described.

Edit: Fully agree on the Amazon style WBR, what you said is exactly what is happening at Amazon. Daily during Q4 peak for a large enough subset of metrics.