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This is an R&D project on design optimization of the inner shield of the Omega colour picture tube at Samsung SDI in Korea. This was an R&D project which basically used the IDOV (Identify, Design, Optimize, Validate) process for Six Sigma implementation. Most Six Sigma projects use the process of DMAIC (Define, Measure, Analyze, Improve, Control). However, this project introduces a new cycle, RDIDOV (Recognize, Define, and IDOV∥. Here CPT means Colour Picture Tube. Samsung SDI is one of the two companies which began Six Sigma in Korea. This case study shows a good exmaple how an R&D Six Sigma project can be usefully employed in manufacturing companies using a new process cycle.