In 1924, W. A. Shewhart of Bell Telephone Laboratories developed a statistical chart to control product variables. This chart is the beginning of statistical quality control as we know it.

After the second world war, engineers W. Edwards Deming and Joseph M. Juran, who worked as consultants in the Japanese manufacturing industry, created the concept of Total Quality, in which quality extends beyond the manufacturing process to all organizational processes and instills the values of quality in every worker called – Total Quality Management (TQM)

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