I am going to assume that anyone interested in this book does not need motivation with respect to why someone would want to investigate a computer or other digital device, so I will skip the customary numbers and statistics. This book is about how you can conduct a smarter investigation, and it is about data and how they are stored. Digital investigation tools have become relatively easy to use, which is good because they reduce the time needed to conduct an investigation. However, it also means that the investigator may not fully understand the results. This could be dangerous when the investigator needs to testify about the evidence and from where it came. This book starts with the basic foundations of investigations and computers and then examines volume and file systems. There are many ways of conducting an investigation, and this chapter describes one of them. You do not need to take the same approach, but this chapter shows where I think the contents of this book fit into the bigger picture.