Description: This white paper introduces data warehousing concepts. This paper is derieved from the first two chapters of our forthcoming book Data Warehousing with MS SQL Server.This paper introduced the fundamental concepts of data warehousing. It is important to note that data warehousing is a science that continues to evolve. Many of the design and development concepts introduced here greatly influence the quality of the analysis that is possible with data in the data warehouse. If invalid or corrupt data is allowed to get into the data warehouse, the analysis done with this data is likely to be invalid.