What you will learn in this chapter of the book is how to plot data and how to spot opportunities from these plots. You will also learn what a normal distribution of data is and some terminology that describes this distribution. Like that in the previous section, this information will help you to solve many real problems and is needed for Six Sigma work. Plotting data is a necessary step in implementing many of the Six Sigma tools. It is used in all the steps of the DMAIC methodology.