O
olso99
Is process control always a requirement if ongoing (longterm) process capability needs to be known?
If the process is not in control, is Ppk ok to use rather than Cpk?
Why would Cpk be the chosen metric for ongoing capability rather than Ppk? I ask this since Cpk represents the best the process could do if no special causes and Ppk represents what the process is actually doing ( I assume includes special causes). I don't understand why a customer would care about anything except for what the process is doing (Ppk)
Thx
Mike
If the process is not in control, is Ppk ok to use rather than Cpk?
Why would Cpk be the chosen metric for ongoing capability rather than Ppk? I ask this since Cpk represents the best the process could do if no special causes and Ppk represents what the process is actually doing ( I assume includes special causes). I don't understand why a customer would care about anything except for what the process is doing (Ppk)
Thx
Mike