Data Integration Myth #6: We can do this project without the help of the line of business.

You think so, do you? If you don't work with the business users, how are you going to know their real needs? How will you understand what their data really means and how they use it? They may have issues with data consolidation and manipulation that you couldn't possibly imagine on your own. Do you really know what they're doing squirreled away in their cubicles, staring at Excel spreadsheets? You should You can't solve a problem if you don't know it exists.