A paraphrased overview of the ASQ black belt certification 'body of knowledge' requirements for 'Six Sigma improvement tools' is shown in Tables 5.6-5.8 in terms of the five project stages used in standard Six Sigma. These five stages, define, measure, analyse, improve and control are discussed in Chapter 6 and shown in extended form pictorially in Figure 6.8. It is seen that there is a considerable body of statistical knowledge required for certification of an ASQ accredited black belt. The practical application of the more generally used techniques in Six Sigma projects are covered in British Standard 600 (SS/3:BSI, 2000) at the black belt level of understanding. The pocket size Memory Jogger (Brassar, B. and Ritter, D., 2000) [available in the United Kingdom from the Institute of Quality Assurance] also covers the more fundamental statistical methods in a very practical manner. This, or a similar guide, for example, the Process improvement pocket advisor (Qualpro, 2000) should be in the hands of everyone involved in the Six Sigma initiative.