3. The Six Sigma tools are basically concepts and tools used to improve the outcomes of the business operations. Their subjectivity derives from two sources: the person applying the tools and the subjectivity of the tools. First of all, the individual is implementing the tool; therefore he is likely to be subjective in judging the tool, implementing it and analyzing the results. Secondly, the tool itself is subjective as it is centered on improving a certain shortage, disregarding other problems. In other words, a Six Sigma tool can be implemented to resolve a particular problem, but the means of resolving this problem might not generate the desired overall effect upon the company.

Six Sigma tries to replace subjectivity with objectivity and intuition with data wherever possible. While this is appropriate for some operations -- like administration, logistics, and manufacturing -- it's detrimental to exploratory research and design, which depend on subjectivity and intuition" (Riley, 2007).

In addition, the Six Sigma tools are rather difficult to implement basically because they try so hard to reduce subjectivity by implementing numerous statistical methods. However a main purpose of the Six Sigma tools is to reduce subjectivity, it doesn't always happen. "Six Sigma is a highly objective concept. Many tools used in Six Sigma like QFD, FMEA...

"Some amount of subjectivity may be encountered when Six Sigma is applied in transactional areas where the numerical data at times is not measured and do not exist, for instance, say in case of a measuring marketing effectiveness, customer preference or knowledge transfer" (Abhishek, 2004).