Before we begin, I am going to ask a question of the reader, "do you have a data description document?" Something in writing (written down, not just in your head) that describes your data requirements and how you will be using your data. I know that some people are thinking that I want you to have a E-R diagram fully developed, that is not the case. I just want the reader to have some sense what data they will be working with, how is that data related (or not), what they need to do with the data, etc. If you know those things then you will be able to determine what issues are relevant to you and how important are they.
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