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One of the most popular books regarding Lean Manufacturing is the Toyota Production System written by Taicchi Ohno. Many simple concepts were introduced but are actually hard to "see". You have to teach people how to "see" the problems and waste becuase waste and variation have often become accepted without really paying attention to it any longer. The focus is on detection variation, abnormalities (jidoka) and by observing the actual process (gemba). Then ask Why...and Why. Why, and so on until you get the true root cause(s). Then relentlessly pursue ways to PREVENT and DETECT abnormalities and eliminate waste.
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Six Sigma Certification
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Cause & Effect Matrix
Central Limit Theorem
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