A System Without a Name --Dickeson

Predictability. Process behavior charting (XmR paired charts) should be utilized for continuous process improvement and for predicting the range of processes and systems. The XmR Average and Moving Range charts establish control limits and identify exceptional variation to be eliminated.

These principles are adapted from Walter Shewhart/W. Edwards Deming (continuous improvement), Peter Drucker (activity-based measurement), Eliyahu Goldratt (throughput and Theory of Constraints), Donald J. Wheeler (process behavior charting), numerous writers on Contribution Analysis, my own experience and many others.