[voakbasda]

It seems that one basic misunderstanding is the idea that you could just jump into the deep end and start producing six sigma quality at scale. You can’t. Each sigma represents an order of magnitude of additional work at refining the production process, and that does not happen overnight.

[Closi]

Totally agree - you don't put an andon cord on your production line or 'do six sigma' and suddenly get perfect car quality - it's a slow and incremental process.