3.13 Over the course of the contract, the Department was careful to honour its obligations, in particular its duty to pay the relevant portions of the unitary charge from the dates when the Independent Certifier issued his certificates of completion. For example, when the Independent Certifier issued his completion certificates for the construction phases containing the laboratories that had failed to meet the most stringent sub-audible noise requirements, the Department was not satisfied that the laboratories were of the required standard. Nonetheless, the Department acted on advice that it should pay the relevant portions of the unitary charge, although it notified Laser that the payments were made under protest. In parallel, the Department put in train a legal process to overturn by adjudication the certificates upon which payment of the unitary charge depended.