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LSL and USL stand for “Lower Specification Limit” and “Upper Specification Limit” respectively. Interested in assessing your knowledge of Lean Six Sigma? Preparing for certifications? Testing your students and trainees? This test is useful for anyone. Download scientific diagram | 1 The Six Sigma Process: USL = Mean + 3 , LSL = Mean -3 from publication: Statistical Methods and Inspection Techniques in. An excellent overview of the six sigma methodology, how to apply it, and. I would like to know the actual difference between UCL and USL. In Six Sigma we want to describe processes quality in terms of sigma.

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