![]() Shewhart consulted with Colonel Leslie E. Along with a team at AT&T that included Harold Dodge and Harry Romig he worked to put sampling inspection on a rational statistical basis as well. Statistical control is equivalent to the concept of exchangeability developed by logician William Ernest Johnson also in 1924 in his book Logic, Part III: The Logical Foundations of Science. Shewhart developed the control chart in 1924 and the concept of a state of statistical control. Shewhart at Bell Laboratories in the early 1920s. Statistical process control was pioneered by Walter A. SPC makes it less likely the finished product will need to be reworked or scrapped. In addition to reducing waste, SPC can lead to a reduction in the time required to produce the product. In the second phase, a decision of the period to be examined must be made, depending upon the change in 5M&E conditions (Man, Machine, Material, Method, Movement, Environment) and wear rate of parts used in the manufacturing process (machine parts, jigs, and fixtures).Īn advantage of SPC over other methods of quality control, such as " inspection," is that it emphasizes early detection and prevention of problems, rather than the correction of problems after they have occurred. ![]() SPC must be practiced in two phases: The first phase is the initial establishment of the process, and the second phase is the regular production use of the process. An example of a process where SPC is applied is manufacturing lines. Key tools used in SPC include run charts, control charts, a focus on continuous improvement, and the design of experiments. SPC can be applied to any process where the "conforming product" (product meeting specifications) output can be measured. This helps to ensure that the process operates efficiently, producing more specification-conforming products with less waste scrap. Statistical process control ( SPC) or statistical quality control ( SQC) is the application of statistical methods to monitor and control the quality of a production process. ( March 2022) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. ![]() This section needs additional citations for verification.
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