8.1 The Consultant may propose to the Client a variation which the Consultant considers necessary. The Client may, in its absolute discretion, approve or reject a variation proposed by the Consultant. The Consultant must not carry out a variation except as directed by the Client.
8.2 A variation made necessary due to any default of the Consultant in the performance of its obligations under this Contract will not result in any payment to the Consultant, any increase in the Contract Price or any adjustment to the Schedule.
8.3 The valuation of the variation must be calculated according to the applicable rates set out in a separate schedule of rates attached to this Contract (if any) or to be determined between both parties on a fair and reasonable basis.
8.4 In case of variation any addition or deduction to the Contract price and any amendment to the Schedule shall be specified in a supplementary agreement which will be signed between the Client and the Consultant.