The authorisation to sub-contract makes the works directors and the company contacts responsible for documental check activities, and Vendor Rating and Hera 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, as well as the request of the Criminal Records Office.