Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. This process of Cleansing and Conforming Data change data on its way from source system(s) to the data warehouse and can also be used to identify and record errors about data. The latter information can be used to fix how the source system(s) work(s). Good quality source data has to do with “Data Quality Culture” and must be initiated at the top of the organization. It is not just a matter of implementing strong validation checks on input screens, because almost no matter how strong these checks are, they can often still be circumvented by the users.

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