IV-2 REPORTS: Progress Charts - The Contractor shall witha. in five (5) days after date of commencement of work pre- pare and submit to the Contracting Officer for approval a practicable schedule, showing the order in which he pro- poses to carry on the work, the date on which he will start the several salient features (including procurement of materials, plant and equipment) and the contemplated dates for completing the same. The schedule shall be in the form of a progress chart to indicate the percentage completed at any time. The chart shall be corrected at the end of each month and delivered to the Contracting Officer, bd. Records and Books of Account - The Con- tractor shall keép records and books of accounts at a place mutually agreeable, showing the actual cost to it of all items of labor, materials, equipment, supplies, services, and other expenditures of whatever nature of which reimbursement is authorized under the provisions of this contract and as prescribed in Article VIII of the contract. As further prescribed in Article VIII, the Commission shall at all reasonable times be afforded access to such records and books of account. ¢. Fiscal Reports - The Contractor shall make such fiscal reports to the Commission with respect to activities under this contract as the Commission may require from time to time, such reports to be in the form prescribed by the Commission. ad. Breakdown Estimate: (1) Prior to the execution of the contract or modifications thereto, the Contractor shall submit to and obtain approval of the Contracting Officer or his duly authorized representative a breakdown estimate in duplicate. This breakdown estimate shall include indivi- dual items and shall be in sufficient detail to show approximate quantities and type, kind, material and equipment involved. character of work, The individual quanti- tles and cost estimates are approximate only and changes may be requested in the work items by means of directives without formal modification of the contract, except that for changes which materially increase or decrease the Scope of the work to be performed, there will be an adjustment in the payments to be made to the Contractor in accordance with Article XIII of the contract. GC-10