pec limit?USL = Upper spec limitРNATURE OF THE PROBLEM: ?A STATISTICAL PERSPECTIVEРEvolution of Six Sigma QualityРSix SigmaРProduct Quality – 1940sРProcess?Quality – 1980sРManagement?Quality - 1990sРNew MillenniumРA Historical PerspectiveРClassical View of PerformanceРPractical Meaning of “99% Good”:?20,000 lost articles of mail per hour?15 minutes of unsafe drinking water each day?5,000 incorrect surgical operations per week?2 short or long landings at most major airports each day?200,000 wrong drug prescriptions each year?No electricity for almost 7 hours each monthР3 SigmaР4 SigmaР6 SigmaР93.32%Р99.38%Р99.99966%РHistorical?StandardРCurrent?StandardРNew?StandardРCapabilityРLong-Term?YieldРStandardРThe Goals of Six SigmaРDefect ReductionРYield ImprovementРImproved Customer SatisfactionР e
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