What can you conclude about the process capability, i$.$e$.$ capability of this machine $($and the tool used$)$ to cut the keyseat to specifications? Next week you will see that six sigma capable processes have capability indices Cp $2$ and Cpk $1\mathrm{.}5.$ DeGarmo mentions that a manufacturing process should have at least Cp $1\mathrm{.}33($which is four$-$sigma capable process, provided it is reasonably centered$),$ and that is considered as $$mediocre$,$ or $$industry average.$$ Two$-$sigma $($Cp $=0\mathrm{.}67)$ capability reflects poor quality, or $$non$-$competitive$$ manufacturing.