Data quality control is one of the most difficult challenges for today’s large and medium-sized enterprises. Just managing the names of suppliers, or of customers in contact with customer care is overwhelming, not to mention the latest developments over recent years, newsletter subscribers and company blogs, for example. Different groups, yet united by the same characteristic: their importance to the company. The supply of spare parts, materials and products, in fact, depends on suppliers. Likewise, the brand’s reputation, and therefore the company's image in the public eye, depends on customer service. The same goes for the many people who follow the company and are registered on the official website: these people represent a company’s most important customer base. This set of contacts must be organised with great care, so as to obtain top quality data.