Include outside data sources such as suppliers, customers and other agencies. Size matters, so plan for serious data storage and DBMS capability for the warehouse itself. OLAP lets you interact with the data, exploring relationships without a predefined path. This is why you wanted the warehouse in the first place.
Government runs on information.
A lot of it. It's not surprising that agencies are interested in data warehousing. Colo. Though widely used, it's also largely misunderstood. Before we look at specific types of data warehousing tools, let's clarify a few terms. A data warehouse is a large collection of data from multiple sources within an organization.