William wishes to thank Stuart Mullins, Lucidity Consulting Group, for his contribution to this month's column.

In recent years, corporate scandals, regulatory changes and the collapse of major financial institutions have brought much warranted attention to the quality of enterprise information. We have seen the rise and assimilation of tools and methodologies that promise to make data cleaner and more complete. Best practices have been developed and discussed in print and online. Data quality is no longer the domain of just the data warehouse. It is accepted as an enterprise responsibility. If we have the tools, experiences and best practices, why, then, do we continue to struggle with the problem of data quality?

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