D e s p i t e t h e i n c r e a s i n g i n t e r e s t f o r S i x S i g m a 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

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... nd 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 via existing ways. To analyze data we have used descriptive statistics (charts, frequency, average, Frequency percent, etc) and deductive statistics (Anova, x 2 , etc). The outputs show that more than 77 % of the participants suggest that all 11 factors mentioned in this research is significantly important for implementing six sigma in Companies of Yazd House of Industry and Mine. These factors include top management and leadership, six sigma teams, strategic planning, competitive benchmarking, process management, human resource development, education and training, quality tools, information and analysis, customer management and supplier management. A practical model for implementing six sigma in companies of Yazd House of Industry and Mine is also presented in this research out of research findings.