For last 15 years, Six Sigma that many leader companies have put into practice, help companies to increase their profit and develop by making their process more effective. Six Sigma focuses on quality more than speed. Lean Management removes weakness of Six Sigma on speeding process. In this study, the Lean Six Sigma methodology developed by using these two techniques together is presented. The goal of application is making process lean and increasing the level of sigma. The necessary preventions and recommendations for decreasing defects are presented in this study performed in one of the leading white goods company.