The authorisation to subcontract makes the works directors and the company contact individuals responsible for document checking activities, and Vendor rating and assurance of Hera Spa responsible of the process validation, the checking of the social security contribution regularity, the control of the list of qualified suppliers and their rating, the search of the Anac electronic records and, if necessary, the request for anti-Mafia information from the Prefecture with direct access to the National bank of anti-Mafia data, as well as the request of the Criminal Records Office.