20.11 The Authority's Representative may carry out audits of Project Co's quality management system (including all relevant Quality Plans and any quality manuals and procedures) to establish that Project Co is complying with Clauses 20.1 and 20.3. The Authority's Representative may carry out such audits at approximate intervals of three (3) months and may carry out other periodic monitoring, spot checks and auditing of Project Co's quality management systems. Project Co shall procure that the Authority's Representative shall have an equivalent right in respect of the Contractor's and the Service Providers' quality management systems. Project Co shall co operate, and shall procure that any Sub-Contractor co-operates, with the Authority's Representative including providing him with all information and documentation which he reasonably requires in connection with his rights under this Clause.