Editor's Note: This article is the last in a three-part series focusing on the data warehouse evolution.

The first evidence of a split in the data warehousing ranks came with the introduction of the concept of data marts. The difficulty of selling, designing and implementing an enterprise solution caused a high casualty rate among the early adopters. Many abandoned any attempt to plan top down Those that succeeded concentrated on delivering business value and started small and grew incrementally. The best of the breed operated with a plan that would grow to support cross-functional needs. In effect, they built to enterprise scope one piece at a time.

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