For some reason BI seems to frequently exist in the realm of ad hoc development. Entire systems are created with hundreds of tables and billions of records, and the only test is the final product.
How do you keep these projects from failing? Requirements! I was sceptical, but a funny thing happened while I was writing detailed report requirements. The business got exactly what they wanted, and it was tested. It seems that, although most businesses want reports instantly, they'd rather have accurate reports a little later.
As BA's we've always understood that a well documented requirement, is one of the best ways to ensure an accurate design.
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