One of the worst things that can happen to an information system is for incorrect data to appear on management reports. Nothing can kill the reputation and potential adoption of an information system faster than "wrong" data. Fortunately, in most cases the incorrect data has nothing to do with the business intelligence tool that created the report. The incorrect data more than likely stems from a data quality issue.
Data quality issues surface for a number of reasons: glitches in the data entry process, poor transformations and merges when multiple data sources are brought together, and often from missing data. The bottom line is garbage in, garbage out. If incorrect data is put in during the data entry process, the incorrect data will appear in a report when it is brought out of the database.
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