A collection of strategies and statistical methods for ensuring high-quality results in manufacturing and service processes. Traditionally, the statistical methods associated with statistical process control (SPC) have focused on process monitoring. As a result, some experts argue that statistical process control is a misnomer and that the term statistical process monitoring is more appropriate. Others argue that statistical quality control methods have become so entwined with strategic decisions and daily operations that the term statistical process control is entirely appropriate. Regardless, statistical process control methods and philosophies are essential tools for survival in today's highly competitive environment.