I think that's the formal production engineering definition -the trouble comes when you apply it to the messy world of software. Its easy for Tesla to say ok i

I think that's the formal production engineering definition -the trouble comes when you apply it to the messy world of software. Its easy for Tesla to say ok if we spend X Million on this machine tool which can work to 10 Thou rather than 20 Thou it will reduce our wastage rate for widget Z by Y% there for the payback period is so many months - classic production engineering 101.