Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Ihe odide: E debara aha "Six Sigma" na June 11, 1991 dị ka U.S. Service Mark 1,647,704. N'afọ 2005, Motorola nyere ihe karịrị ijeri US $ 17 na ego maka isii Sigma. Ndị ọzọ na-ebute ụzọ nke isii Sigma gụnyere Honeywell na General Electric, ebe Jack Welch webatara usoro ahụ. Ka ọ na-erule ngwụcha afọ 1990, ihe dị ka ụzọ abụọ n'ụzọ atọ nke ụlọ ọrụ Fortune 500 amalitela atụmatụ isii Sigma na ebumnuche nke ibelata mmefu na imeziwanye ogo. N'afọ ndị na-adịbeghị anya, ụfọdụ ndị na-eme ihe jikọtara echiche isii Sigma na imepụta ihe iji mepụta usoro a na-akpọ Lean Six Sigma. Usoro Lean Six Sigma na-ele anya n'ichepụta ihe, nke na-eleba anya na usoro usoro na ihe mkpofu, na Six Sigma, na-elekwasị anya na mgbanwe na imewe, dị ka ọzụzụ na-agbakwunye iji kwalite "azụmahịa na arụmọrụ arụmọrụ".Na 2011, International Organization for Standardization (ISO) bipụtara ụkpụrụ mbụ "ISO 13053:2011" na-akọwa usoro Six Sigma. E mepụtara ụkpụrụ ndị ọzọ site na mahadum ma ọ bụ ụlọ ọrụ ndị nwere mmemme asambodo nke mbụ maka Six Sigma.  Ajụjụ: Ego ole ka e chebere site na Six Sigma?
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