The critics of Six Sigma are found every where and their argument is why Six Sigma fails at some companies which shine at others. Since there is no certifying authority or governing body for Six Sigma certification, the self induced publicity by a company that it has implemented Six Sigma is a questionable practice. The ISO 9000 standards lay down the guiding standard of quality control and if you meet them, you are certified by the ISO, but in case of Six Sigma it is self certification and many companies boast about their achievements of Six Sigma implementation while there is no one to check the actual position.

Some of the companies which went for implementation of Six Sigma have not performed well. In fact the fortune magazine reports that of the 58 large companies which announced the implementation of Six Sigma programs almost 54 companies are lagging in the S