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Integration of large databases by expert teams is only a small part of the data integration activities that take place. Users without data integration expertise very often gather, organize, reconcile, and use diverse information as a normal part of their jobs. Often, they do this by copying data into a text file or spreadsheet. In doing so, they make significant data integration decisions. They often express a mental model, or schema, over their data. They organize data to describe real-world entities. They reconcile redundancy and disagreements in their data.
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