The authorisation to subcontract makes the works Directors and the company contact individuals responsible for documental check activities, and Vendor Rating and Hera Spa Assurance responsible for the validation of the process, 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 Prefectural anti-mafia information with direct access to the National bank of anti-mafia data, as well as the request of the Criminal Records Office.