Chapter 15Qualitative Techniques
He that will not apply new remedies must expect new evils; for time is the greatest innovator.
—Francis Bacon
15.1 Introduction
Chapter 9 reported the advanced quantitative techniques of analysing data and improving process performance. In this chapter we deal with another category of techniques which we named ‘qualitative techniques’. Although they are data driven, they depend heavily on logical reviews and judgemental assessments. There are numbers, but the improvements are not directly derived from a statistical process or a numeric solution. There are many such qualitative techniques, and we have selected the most relevant ones for Six Sigma and operational excellence programmes ...
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