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Nowadays internal combustion engine design is characterized by a faster development time with increased levels of quality, NVH, specific power and lower weight all being demanded at a lower production cost. This requires a new and systemic design management from the outset of the concept to SOP (Start of Production). The design for Six Sigma (DFSS) process is the surest way to achieve the above mentioned development goals. Within a Six Sigma approach, manufacturing and serial production issues are considered from the beginning of the development phase. Based on examples, the methodology will be explained in single steps. The explanation will include QFD, FMEA (product and process), scorecards, DOE and kneading process with its tolerance analysis and process capability investigations. The use of these different tools for each phase of the design process will be described.