This common manufacturing philosophy is the combination of a number and a Greek letter. Together, they refer to a set of techniques and tools for process improvement. Jack Welch made it central to his business strategy at General Electric in 1995. What is the two-word name of this technique?

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1. This common manufacturing philosophy is the combination of a number and a Greek letter. Together, they refer to a set of techniques and tools for process improvement. Jack Welch made it central to his business strategy at General Electric in 1995. What is the two-word name of this technique?