Subject to any variations or changes that McConnell Dowell may direct as provided in clause 3.2, this Agreement (and for the avoidance of doubt, including each an all Plant Requests, as these may be issued from time to time) constitutes the entire agreement between the Owner and McConnell Dowell, and supersedes any request for quotation, Owner's quotation, all negotiations and/or previous agreements either written or oral, with respect to the subject of this Agreement, made prior to the date hereof, including, for the avoidance of doubt, any terms and conditions of hire that may have been previously provided by the Owner, and which are not expressly included in this Agreement