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The Individuals and Moving Range chart (IMR chart) is the workhorse of statistical process control (SPC). These charts, sometimes called process behavior charts, can be constructed quickly. People who are new to SPC can be brought up to speed on IMR charts in just a few minutes and they can be taught to plot new data on the charts themselves. This makes the IMR chart ideal for use as a process control tool in real time. Real time SPC is the best way to identify problems quickly and, perhaps even more important, to do so soon enough to identify the cause of the problems. Pyzdek Institute Lean Six Sigma Master Black Belt Steve Czupryna explains one of the most important process improvement tools in plain language.