Chap009运营管理

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1、ChapterNineQualityControlandImprovementOperationsManagementContemporaryConceptsandCases5/eChapterNineOutlineDesignofQualityControlSystemsProcessQualityControlAttributeControlVariablesControlUsingControlChartsProcessCapabilityContinuousImprovementSixSigmaLeanandSixSigma

2、QualityControlandImprovementinIndustryChapterEmphasisProcessdefinitionStatisticalqualitycontrolContinuousimprovementDesignofQualityControlSystemsBreakdownproductionprocessintosubprocessesand“internalcustomers”Identify“criticalpoints”whereinspectionormeasurementshouldta

3、keplaceFourstepsindesigningQCsystemsStepsinDesigningQCSystemsIdentifycriticalpointsIncomingmaterials&servicesWorkinprocessFinishedproductorserviceDecideonthetypeofmeasurementVariablesAttributeDecideontheamountofinspectiontobeusedDecidewhoshoulddotheinspectionTypesOfMea

4、surementAttributemeasurementProduct/servicecharacteristicevaluatedwithadiscretechoice:Good/bad,yes/noVariablesmeasurementProduct/servicecharacteristicthatcanbemeasuredonacontinuousscale:Length,size,weight,height,time,velocityWhentheInspectorFindsaDefect…Containment:Kee

5、pthedefectiveitemsfromgettingtothecustomerCorrection:FindthecauseofthedefectandcorrectitPrevention:PreventthecausefromhappeningagainContinuouslyimprovethesystemWhentheInspectorFindsaDefecte.g.StraponbackpackcomeslooseContainment:pullthebadbackpacksfromtheproductionline

6、Correction:sewingmachinemisaligned;fixitPrevention:whywasitmisaligned?Findoutandchangesystemtopreventithappeningagain;mayrequireadditionaltrainingContinuouslymonitorandimprovesystemProcessQualityControlBasicassumptions(tenets)ofProcessQualityControl:Everyprocesshasrand

7、omvariationProductionprocessesarenotusuallyinastateofcontrol“StateofControl”-whatdoesitmean?UnnecessaryvariationiseliminatedRemainingvariationisbecauseofrandomcauses“It’sourjobtodrivetherandomnessout.”--BillJames,statisticianfortheBostonRedSoxWallStreetJournal,20June20

8、07,p.D7.ProcessQualityControlAssignable(special)causesCanbeidentifiedandcorrectedCommoncausesOccurrandomlyCannotbecha