Dun & Bradstreet collects data from over 30,000 global sources to maintain records on over 233 million companies worldwide. They use a proprietary process called DUNSRight that involves global data collection, entity matching, assigning D-U-N-S numbers, determining corporate linkages, and using predictive indicators to ensure high data quality. Data.com also sources data from its community of over 2 million members who contribute and update contact records, as well as validating data through technological processes. Both Data.com and Dun & Bradstreet have dedicated teams that continuously monitor data quality and make improvements to their methods.