As I said in the introduction to Part 4, there is neither the space nor the necessity for me to provide a guide to each statistical process and test discussed in this chapter. There is a plethora of information available on these procedures, explaining how to perform them and indeed even explaining the software to perform them. Some internet sites will even perform certain tests on datasets without the need to purchase specific software. The purpose of this chapter is to present a discussion on the nature of numerical datasets, the appropriateness of statistical analysis and the fundamental principles involved in the procedures for this analysis. This chapter is concerned with techniques for processing and displaying data, ways of exploring datasets and analysis of relationships between datasets; it is not about how to do it. The discussion is concerned with when to do what to your data and why you do it. I would strongly urge that you use one or more of the recommended texts listed at the end of this chapter to become familiar with the processes involved.