The classical six sigma process performance measures as “Defects Per Million Opportunities” (DPMO) and the Sigma levels considering the approximated Schmidt e Launsby equation (Breyfogle III, 2003) were defined (see equation (3) and (4), respectively) where the number of opportunities (NO) for failure (Mehrjerdi, 2011) were estimated by the number of process steps where defects may occur, or by the number of features that can cause non-conformities and the Number of Units (NU) the number of projects on the sample.