Short Presentation What is Six Sigma

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Short Presentation What is Six SigmaEsta apresentação foi usado como referência para escrever outro trabalho, da disciplina de Administração, no curso de Engenharia Mecânica.

Transcript of Short Presentation What is Six Sigma

Six SigmaSix Sigma66Sam Tomas, CFPIM, CRM, C.P.M.Kokopelli2What is Six Sigma?Sigma is the Greek letter that represents the standarddeviation or vaia!ilit" of a group of items from their average value.A Six Sigma program is therefore a vaia!ilit" reducing program.The key objectives include improved processes product performance and reliabilityNumber of DefectsSix Sigma is a reference toa particular goal of reducingdefects to near !ero.#What $lse is Six Sigma?A concept that provides a relatively ne" "ay to measure ho" good a product is. #t relates to a manufacturing or service failure rate of only $.% rejects per million operations or a yield of &&.&& && && '(. )hen a product is six sigmait tells us that the *uality level is excellent.%Wh" Six Sigma?The inade*uacy of &&.&( accuracy can be illustrated as follo"s+,,--- checks "ill be deducted from the "rong bank accounts in the next .- minutes''---- credit cards in circulation "ill have incorrect cardholder information on their magnetic strips,.'/-- defective tires "ill be shipped this year0'$,, pieces of mail "ill be mishandled the next hour0%,-' defective computers "ill be shipped this year)hy spend money to achieve six sigma *uality "hen perhaps &&( or &'( perfect "ould be totally ade*uate1 /%&t With Six Sigma '&alit" ()&g pes*iptio+s2ne incorrect drug prescriptions every ,/ years.S&gi*al opeatio+s2ne incorrect surgical operation every ,- yearsMail )elive"2nly one article of maillost every $/ years,The %atht&! C&veSho"s reliability of a product in terms of -ail&e ate pe mo+thThe curve presents t"o shaded areas.ate+t /e-e*t ate 3auses early failure after a product is deliveredI+hee+t -ail&e ate 4unction of product design materials processes and technologies used in manufacturing.5efects in manufacturing are caused by+6arro" /esig+ margins for the product#nsu7cient manufacturing po*ess controls8oor incoming mateials0pats *uality1The %atht&! C&ve)esig+(Relate/ 2I+hee+t3 Fail&es'&alit" Fail&es /&e toPo*ess 4 MateialWea o&tFail&esTimeFail&

e RateFail&

e RateII+-a+tMotalit"II5se-&l.i-eIIIWea o&t6veall .i-e Chaa*teisti* *&ve.ate+t)e-e*tsI+hee+t Fail&e 7eaTime', Sigma8es&s 9 Sigma9ven "ell controlled processes experience shifts in the mean as great as : ;(;02 sta+/a/ /eviatio+s. A normal % sigma process plus a 0:0;, sigma shift in the process average "ould result in % sigma variations of ,,2;< /e-e*ts per million operations.)hy attempt to achieve . sigma "hen % sigma may be ade*uate1&=iel/ Rates o-Six Sigma Po/&*ts#t is possible to build a product in "hich each component is a six sigma component and yet have the product exhibit yields of only &-( '-( =-( .-( etc. )hat "e are talking about is rolled:throughput yield or the probability that all product process and material characteristics "ill simultaneously conform to their respective standards. 0-Impoveme+t $>ots Re?&ie/ to Rea*h Six Sigma9#;< @ Impoveme+t..'0- dpm.,0- dpmA#< @ Impoveme+t,,$ dpm,1< @ Impoveme+t$.% dpm)pmB /e-e*ts pe millio+0-00Whee ae 7veage Compa+ies i+ '&alit"?7ppoximatel" 2 Sigma#?S @ Tax advice over the phone7ppoximatel" 9 Sigma 27veage3?estaurant bills5octor prescription "riting8ayroll processing2rder "rite:ups7ppoximatel" , SigmaAest in class @ Seiko B8 #nc. etc.,.A Sigma5omestic Cight fatality rate 29,,.A0,Relatio+ship o- )e-e*ts to 6the Fa*tosThe . sigma concept indicates there are strong relationships bet"een product defects and such factors as+Relia!ilit"Po/&*t "iel/sC"*le timesI+ve+toiesS*he/&lesThe higher the sigma value the more reliable the process being monitored and the higher the improvement in all areas.0$Fi+a+*ial Impli*atio+so- .oC SigmaThe lo"er the sigma level the higher the repair costsA % sigma company spends more than 0/( of its sales dollars for internal and external repairsA . sigma company spends about 0(2ver the long run a % sigma company "ill not be able to compete "ith a . sigma company.;9What is the Cost o- '&alit"?Goal+ #mprove cost *uality and schedule performance via process improvement and reduction of process variations.Sigma Level Defects Per Million Opportunities Cost of Quality2 308,537 (Noncompetitive companies) N/A3 ,807 25!"0# of sa$es4 6,21 !"n#ustry average$ 1%&2%' of sales5 233 5!%5# of sa$es6 ()4 !*orl# Class$ 1' of salesDoteE $a*h sigma impoveme+t epese+ts a ;