The main aim of using SPC is to understand where the focus of works needs to be done in order to make a difference. Here we can determine if an improvement is actually happening and also use them to predict whether it is statistically capable to meet the specific target or not. Statistical process control also termed as SPC is a statistical method used to monitor, control and improve processes by eliminating variation from industrial, actuarial, service and many other processes. His work was summarized in his books titled “ Out of the Crisis” (1982 – 1986) and “ The New Economics for Industry, Government, Education” (1993), which includes his System of Profound Knowledge and the 14 Points for Management. Later other countries started implementing SPC in their process. He trained hundreds of engineers, managers, and scholars in SPC and concepts of quality.ĭuring the 1960s and 1970s, SPC grew rapidly in Japan and was a successful in quality improvement goals. He received an invitation from the Japanese Union of Scientists and Engineers (JUSE) and worked as an expert to teach statistical control. He was widely known for his work contribution for Japanese industry and for the new development era. He identifies two primary sources of process improvement: eliminating common causes of quality problems, such as poor product design and insufficient employee training, and eliminating special causes, such as specific equipment or an operator. Deming’s approach to quality management results in continuous improvement of the production process to achieve conformance to specifications and reduce variability. He developed and added some of his techniques to Shewhart’s methodology. Deming was also instrumental in introducing SPC methods to Japanese industry after the war had ended.ĭeming’s mastered the Shewhart’s ideas by implementing it to Japanese industry from 1950 onwards. The Allied powers were occupying Japan, and he was asked by the United States Department of the Army to assist with the census. In 1947, Deming was involved in early planning for the 1951 Japanese Census. After the devastating defeat of Japan in World War II, the United States led the Allies in the occupation and rehabilitation of the Japanese state.

Edwards Deming applied SPC methods in the United States during World War II, to improve quality in the manufacture of weapons and other important products needed during the war period. His work was summarized in his books titled “Economic Control of Quality of Manufactured Product” (1931) and “Statistical Method from the Viewpoint of Quality Control” (1939). This leads to improve product quality in a great way. During this period, many initiatives were done by conducting extraordinary research in statistical methods to control and improve process variation. The underlying concept of the Shewhart chart is to construct its limits based on variation allowable as it is in – control state and monitor the quality of the product produced.īell Labs was widely recognized as the ‘international standard for quality’ by the 1930s, due to the large applications of Shewhart’s techniques in the field of telecommunications. A process that is operating with the assignable cause of variation is said to be out of control. A process that is operating with the only chance cause of variation is said to be in statistical control. He has defined chance and assignable causes as the two sources of quality variation. Shewhart developed a visual tool for monitoring process variation, which came to be known as the control chart or the Shewhart control chart and the concept of a state of statistical control in 1924 at Bell Laboratories. He demonstrated that monitoring and controlling variation throughout production was the more efficient and economical way. He recognized that inspecting and rejecting or reworking product was not the most economical way to produce a high-quality product. Bell Labs wanted to economically monitor and control the variation in the quality of components and finished products. He pioneered the use of statistical techniques for monitoring and controlling quality. This lead to an invention of the widely known method as statistical process control (SPC).

Shewhart discovered a way to distinguish between common and special causes of variation in a process.

Checklist to establish spc system