What tools do we use if we want to know who the heavier between you and me? … Right scales. If you want to know more? …. Then the meter is the answer. The same thing applies Thus, if we want to compare two or more different processes and would like to know which one is better performance? Then six sigma was the one measuring instrument. Level of how good, judging from how many products / services that we produce in accordance with customer expectations, or in other words, the smaller the defect produced by our process, then the better our processes. Statistically, six sigma process means we are not going to make the goods more than 3.4 defects per one million products or services received by the customer, the less disability you make it the higher the sigma level.