SHEWART CYCLE Meaning and
Definition
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The "Shewart cycle" is a quality improvement method named after American statistician Walter A. Shewart. It is a four-step iterative process used to effectively manage and improve processes in various sectors, particularly in manufacturing and quality control. The cycle is also known as the Plan-Do-Study-Act (PDSA) cycle or the Deming cycle, as it was further popularized by Dr. W. Edwards Deming.
The first step, "Plan," involves identifying objectives, problem areas, or potential improvements in a process. This entails gathering relevant data and information, setting goals, and preparing a plan for change.
The second step, "Do," requires implementing the identified plan on a small scale. It involves carrying out the changes or improvements in a controlled environment to test their effectiveness, monitoring their impact, and collecting data throughout the process.
The third step, "Study," involves analyzing and studying the data and results obtained from the previous step. It aims to understand the outcomes, trends, and variations in the process, and to determine whether the desired improvements have been achieved.
The final step, "Act," is the stage where the conclusions drawn from the study phase are applied. Based on the analysis, decisions are made regarding whether to sustain, modify, or discard the changes made in the second step. If further improvements are required, the cycle begins again, ensuring a continuous improvement process.
The Shewart cycle promotes a systematic, data-driven approach to process improvement, allowing organizations to strive for efficiency, quality, and continuous improvement in their operations.
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Etymology of SHEWART CYCLE
The term "Shewhart cycle" or "PDCA cycle" (Plan-Do-Check-Act) originated from the work of Walter A. Shewhart, an American physicist and statistician in the early 20th century.
Walter A. Shewhart developed the concept of statistical process control (SPC) and is widely regarded as the father of modern quality control. In his book "Statistical Method from the Viewpoint of Quality Control" published in 1939, he introduced a cyclical process for continuous improvement in manufacturing processes, which eventually became known as the "Shewhart cycle" or "Plan-Do-Check-Act cycle".
The term "Shewhart cycle" was later popularized by his colleague, W. Edwards Deming, who played a crucial role in the development and implementation of quality management principles in Japan after World War II.
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