Your database may be full of valuable information, but its difficult to realize this value if your data is incomplete, inconsistently formatted, inaccurate or unreadable by your applications.
Data cleansing identifies and corrects these problems. It is a major project that requires a great deal of expertise and technical resources. Before doing it on your own, you may want to look around for a hosted service that fulfills your needs.
Download this Project Map for a 7-step plan for cleansing your data.