Hi,
As an QA , one of our prime task is to control the defect % and keep it in control. In simple way, we can audit the transaction and consolidate the defect % and work on creating plan to control it by coaching on the opportunities. May be after six Sigma training or going through the methodologies used, several tools will come into our mind which help us to think and act in a different way. First we plot all defects and find the vital 20% and work on it which inturn reduce the defect number drastically. We can do AAA to understand all auditors along with other support functions are in same page and to rely on the audited data or not. We can use affinity diagram to categorise causes and work simultaneously. Likewise if we have all the concepts known, at every juncture during solving problem, one of the concept will come into our mind and we effectively use it. I believe this helps to stand different from a an QA who don't hold a six Sigma certification.