The various "control" acronyms that take us through the evolution of process automation include: direct digital control (DDC), supervisory computer control (SCC) and advanced process control (APC). DDC marked the beginning of the age of the digital computer in the process control world. SCC evolved out of the early DDC projects in response to the lack of tangible benefits realized from the early DDC projects. APC came of age with the introduction of commercial multivariable predictive control (MFC) products. Those of us who are veteran practitioners appreciate that APC has a history and would agree that it is a history worth recounting.
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