ABSTRACT
Key concepts and tools of control are: Statistical process control (SPC); Control chart guide; Control chart road map; Control plan; and Sustenance of improvements. SPC was pioneered by Dr. Walter Shewhart in the 1920s and later enhanced by Dr. W. Edwards Deming. SPC is a collection of statistical techniques used to measure and analyze the variation in processes. SPC is not a particular technique or procedure, but a philosophy focusing on optimizing continuous improvement by using statistical tools for analyzing data, making inferences about process behavior, and then making a decision. Common causes of variation are inherent in a process all the time. A process that has only common causes operating is said to be in statistical control. Variable control charts monitor key measurable product characteristics or process variables. The control plan is the centralized document to keep track of the status of all significant process characteristics.
