What method do you use to integrate and standardize data for the data warehouse environment?

One of the first technology decisions for a firm planning to develop a data warehouse (DW) is the selection of a method for performing extract, transform and load (ETL) processing. Firms often struggle with whether to use an existing development method or purchase a product from the marketplace. Internally developed proven data integration methods may already exist in the information technology area, thus complicating the selection process. Conducting a proper ETL product evaluation requires substantial time and resources. Business requirements, budgets, time lines and politics are often the key factors in determining which direction a firm takes with its selection.

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