One year ago, many people celebrated the arrival of the new millennium. Now, twelve months later, that new millennium has finally arrived officially. In the Gregorian calendar, there was no year 0 A.D. nor 0 B.C. The year 1 A.D. was the first year of the first decade, first century and first millennium A.D.

The millennium confusion illustrates a significant type of information quality problem ­ data definition quality. What scares me is that we often take data definition flippantly. Especially in the IT industry, we often disregard the importance of robust definition of business terms and data, resulting in impaired business communication.

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