Statistical Process Control (SPC) : A method used for measuring, analysing, detecting and controlling process variation. This method may include the measurable quality characteristics control chart along with other techniques.
–X-Bar and R Chart
–X-bar and S Chart
–np and p Chart
–c and u Chart
Statistical Quality Control (SQC) : The application of statistical techniques (SPC and statistical sampling) to control product characteristics to ensure it meets product specifications or the engineering design specification.