Well, I'm on a roll with all of my other "dumb question" threads, so what's another... We currently do not have any SPC charting in our facility but we're going that direction. Soon. I was under the assumption that it was QA's responsibility to develop the control limits (or at least review them) and then work with the operator if out of control behavior is seen with a process, determine a root cause, and if necessary initiate a CAPA. What's your take on this? In your company, what exactly is QA's role in SPC charting?