Time Rate Basis: COMPANY may direct a change with payment to CONTRACTOR on a time rate basis in accordance with Schedule E of this Section. When sufficient progress has been made in the execution of the change so that COMPANY and CONTRACTOR can agree on the reasonable net effect on CONTRACT Price, then COMPANY may authorize the conversion of the said change to payment on a lump sum basis pursuant to Paragraph 2.3.1 above and make any adjustment to CONTRACT Price. If agreement cannot be reached, payment shall remain on a time rate basis. When the change has been completed and final certified material invoices and time sheets have been submitted by CONTRACTOR and approved by COMPANY, COMPANY shall authorize the required adjustment to CONTRACT Price by issuing a Change Order.