Data warehouses need constant maintenance. Therefore, at the inception, organizations must ensure that they have the appropriate staffing structure to support the building, management and maintenance of the data warehouse. Commitment to long-term staffing--which must meet or exceed the original commitment to actually build the data warehouse--is essential to its success. Roles and responsibilities of the warehouse management team must be clearly defined, and the people who fill those roles must be given the proper support and training. Whether the warehouse is built internally or by external consultants, eventually the responsibility of warehouse maintenance lies with the organization's internal resources.

It is critical that during every phase of the warehouse's construction, internal resources develop skills that will guide the warehouse team to independence from outside vendors, consultants and/or contractors and develop the expertise necessary to evolve with the data warehouse. The data warehouse team can make or break the project.

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