Independent data marts have spread like a disease through many of today's best and most advanced corporations. The devastating nature of this disease is that it is not easily detected in its initial stages; however, if it is not treated, the patient's condition will steadily deteriorate. The "cure" is to migrate the independent data marts to a structured data warehousing architecture.

There are two general approaches for migration: big bang and iterative. Figure 1 summarizes the advantages and disadvantages of each approach.

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