Honest answer, I’ve heard both and they refer to same thing. It’s plus or minus 3 sigma or range of 6 sigma. They are equivalent.
That said it all depends on give and takes. How important is your process? How cheap is your engineer time? You can adjust the sigma amount as appropriate.
Honest answer, I’ve heard both and they refer to same thing. It’s plus or minus 3 sigma or range of 6 sigma. They are equivalent.
That said it all depends on give and takes. How important is your process? How cheap is your engineer time? You can adjust the sigma amount as appropriate.