The Internet has emerged as a low-cost, do-it-yourself data-replication strategy. The timing, however, is ironic because that emergence is occurring at the same time organizations are rolling out database-aided data replication.
Do I need to improve business operations or analyse and project trends? That is one of the questions you must answer before you build your data warehouse. You can't decide after you've built it, because each warehouse requires different tools and approaches.
And besides, to convince management of the warehouse's utility, you first need to know what business problem you're trying to solve