Understanding the data you're working with
Having a general understanding of the data and where it comes from is of vital importance for any QlikView application.
Background
QlikView is nothing without data, and without at least a reasonable understanding of the data needed, you will be missing a vital part of the development process. The data may come from several sources, and an overall understanding of these sources is also important. However, detailed knowledge isn't required—just enough to know when something feels right or wrong. If you happen to have detailed knowledge of the source systems, that's good news, but don't get too hung up on trying to learn every detail as you'll never get to start work on your QlikView application.
How to do it
Most applications use more than one data source, whether it is two or more database tables or multiple tabs from a spreadsheet. While an understanding of the source of the data is important, it is far more important...