3. SPC and problem-solving
SPC must be built as a problem solving instrument. In the phase of the SPC design the
general structure of the problem solving process must be respected and the sequence of the
subprocesses “Out-of control signal revelation – Root cause identification – Corrective action
acceptance – Verification of corrective action” must be the axis of the SPC application. This
axis must be assured with many other actions to really operate.