<p>?ata???ste t?? ??s?a t?? µe??d?? Six Sigma se µ???? 50 ?ept? µe a?t? t? p?a?t??? ?a? s???pt??? ß?ß???. ? µ???d?? Six Sigma e??a? µ?a a?st???, ßas?sµ??? st? stat?st??? µe??d?????a p?? ap?s??pe? st? µe??s? t?? d?????t???? ?a? pa?a??????? ??st??? t?? ep??e???se??, µe??st?p????ta? pa??????a t?? p???t?ta. ??e? p???t?µe? efa?µ???? st? d?a?e???s? ?????, ep?t??p??ta? st?? eta??e?e? ?a e?a?e????? ta e?att?µata, ?a a???s??? t?? a???p?st?a ?a? ?a ep?t????? t??? st?at??????? t??? st?????. ??t? t? ß?ß??? sa? pa???e? µ?a e????st? e?sa???? st?? efa?µ???? t?? ??? S??µa ??a t? ße?t?st?p???s? t?? d?ad??as???, t?? a???s? t?? a???p?st?a? ?a? t? ße?t??s? t?? ap?d?s??. ?e???aµß??e? ep?s?? µ?a e??tas? t?? p?e??e?t?µ?t?? t?? ??? S??µa ??a p?a?µat???? eta??e?e?, ?p?? ? Motorola, ? General Electric ?a? ? Bank of America, µ?a s???t?s? t?? e??e??e?? t?? p??s????s?? ?a? µ?a e?sa???? se s??af? µ??t??a, ?p?? t? Lean Six Sigma ?a? ? ??a?e???s? ?????? ????t?ta? (TQM). </p><p>S?et??? µe t? µ???d? Six Sigma : ? µ???d?? Six Sigma e??a? µ?a d?µ?µ??? p???t??? ?a? p?s?t??? p??s????s? st? d?a?e???s? t?? ep??e???se?? p?? st??e?e? st?? ep?te??? a???p?st?a? ??? t?? 99,99% se ßas???? ep??e???µat???? d?ad??as?e?. ???t?eµfa??st??e t? de?aet?a t?? 1980 ?a? e?ap?????e ?at? t?? ep?µe?? de?aet?a, p??sf????ta? ?µesa ?a? s?µa?t??? ?f??? se µ?a se??? ap? eta??e?e?. ?????? µe???e? eta??e?e? t?? p??t?µ??? p???? ?a? d?d?s?eta? se ????fa?e? s????? ep??e???se?? se ??? t?? ??sµ?. Se a?t? t? ß?ß???, ?a a?a?a???ete p?? ? µ???d?? ??? S??µa µp??e? ?a ß????se? t?? ep??e???s? sa?, ?a ?ata???sete t?? ?p??e?µe?? ?e???a ?a? t?? stat?st???? µe??d??? ?a? ?a µ??ete p?? ?a t?? efa?µ?sete ap?te?esµat???. ??a saf?? e????s? t?? p?e??e?t?µ?t?? ?a? t?? p??a??? µe???e?t?µ?t?? t?? µe??d??, µ?a s???t?s? µ?a? p?a?t???? µe??t?? pe??pt?s?? ?a? µ?a e?sa???? se s??af? µ??t??a ?a sa? d?s??? ta e??a?e?a p?? ??e???este ??a ?a p??sa?µ?sete t?? p??s????s? sa? st?? pe??pt?s? sa?.</p>