Control Phase
It is conceivable that some time man will have knowledge of all the laws of nature so that he can predict the future quality of product with absolute certainty.
—Walter A. Shewhart (1891-1967), the “father” of statistical process control
At this point the project team has gone through the Define, Measure, Analyze, and Improve phases of the six sigma DMAIC process. The black belt or green belt has identified the vital few Xs that have caused the defects and has defined the relationship for the CTQ or Y and the vital few Xs. Now the team must control the Xs that created the problem/defect to ensure a sustained Y or output. That’s the ...
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