In the previous chapter, we developed our datawarehouse model. This was the first chapter that we get our hands on our solution. It is very important to have a correct understanding of that chapter and be familiar with the model in order to consolidate this knowledge that we will acquire for the next set of chapters, as we will have to build upon it. In Business Intelligence, usually we talk about three areas: Database and Datawarehouse design, ETL, and Reporting. We covered the first one, and are now we are just ahead of starting the second one. In this ETL chapter we will see how to Extract, Transform, and Load process the data into our datawarehouse. Let's start!