AbstractDespite the increasing interest for Six Sigma implementations, there is also increasing concern about implementation failures. One major reason many implementations of Six Sigma methodology fail is lack of an effective implementation model. Asking CEOs about the most important factors for successful implementation of Six Sigma methodology the purpose of this research is to study and develop model of six sigma implementation in companies of Yazd House of Industry and Mine. The method used in this research is a descriptive-survey one. The research sample includes 276 top managers (CEOs) chosen randomly from among 1000 ones. To gather data a 63-material questionnaire (translated and altered) whose validity and reliability was achieved ...