2.1. The conception SIX SIGMA
The designation of methodology called conception Six Sigma has its basis in the statistics, where σ is the
standard deviation. According to Škop (2001), this is free interpretation of the Six Sigma; he further clarifies that if
the process is controlled by the method Six Sigma no more than 3.4 defects occur per million units, even including a
fairly common deviation of the mean value of a figure representing the quality of the process by 1.5 σ.